GUARANTORS OF SECURITIES (Condensed Balance Sheet) (Details) - USD ($)  $ / shares in Units, $ in Thousands  | 
Jun. 30, 2019  | 
Mar. 31, 2019  | 
Dec. 31, 2018  | 
Jun. 30, 2018  | 
Mar. 31, 2018  | 
Dec. 31, 2017  | 
| Current assets: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Cash and cash equivalents | 
$ 88,430
 | 
[1] | 
 
 | 
$ 50,753
 | 
[1] | 
$ 15,057
 | 
 
 | 
$ 13,583
 | 
| Receivables: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Trade, operating, net of allowance for doubtful accounts | 
30,493
 | 
 | 
 
 | 
33,306
 | 
 | 
 
 | 
 
 | 
 
 | 
| Trade, dry-leasing | 
5,165
 | 
 | 
 
 | 
3,803
 | 
 | 
 
 | 
 
 | 
 
 | 
| Tax receivables | 
2,680
 | 
 | 
 
 | 
3,187
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other | 
16,478
 | 
 | 
 
 | 
2,343
 | 
 | 
 
 | 
 
 | 
 
 | 
| Inventories, net | 
21,004
 | 
 | 
 
 | 
20,673
 | 
 | 
 
 | 
 
 | 
 
 | 
| Prepaid expenses | 
2,822
 | 
 | 
 
 | 
1,807
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total current assets | 
167,072
 | 
 | 
 
 | 
115,872
 | 
 | 
 
 | 
 
 | 
 
 | 
| Property and equipment | 
918,972
 | 
 | 
 
 | 
917,161
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accumulated depreciation | 
(336,825)
 | 
 | 
 
 | 
(317,967)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Property and equipment, net | 
582,147
 | 
 | 
 
 | 
599,194
 | 
 | 
 
 | 
 
 | 
 
 | 
| Operating lease right-of-use | 
8,080
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Equity investments and advances | 
0
 | 
 | 
 
 | 
27,112
 | 
 | 
 
 | 
 
 | 
 
 | 
| Investments in consolidated subsidiaries | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intangible assets | 
1,098
 | 
 | 
 
 | 
1,107
 | 
 | 
 
 | 
 
 | 
 
 | 
| Deferred income taxes | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intercompany receivables | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other assets | 
6,487
 | 
 | 
 
 | 
21,578
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total assets | 
764,884
 | 
 | 
 
 | 
764,863
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current liabilities: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accounts payable and accrued expenses | 
13,467
 | 
 | 
 
 | 
13,161
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued wages and benefits | 
8,222
 | 
 | 
 
 | 
9,267
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued interest | 
536
 | 
 | 
 
 | 
569
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued income taxes | 
938
 | 
 | 
 
 | 
973
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued other taxes | 
1,410
 | 
 | 
 
 | 
1,268
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued contingencies | 
647
 | 
 | 
 
 | 
630
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current portion of long-term debt | 
1,859
 | 
 | 
 
 | 
2,058
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other current liabilities | 
2,902
 | 
 | 
 
 | 
878
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total current liabilities | 
29,981
 | 
 | 
 
 | 
28,804
 | 
 | 
 
 | 
 
 | 
 
 | 
| Long-term debt | 
158,981
 | 
 | 
 
 | 
160,217
 | 
 | 
 
 | 
 
 | 
 
 | 
| Deferred income taxes | 
106,929
 | 
 | 
 
 | 
108,357
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intercompany payables | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Operating lease liabilities | 
6,387
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other liabilities | 
850
 | 
 | 
 
 | 
747
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total liabilities | 
303,128
 | 
 | 
 
 | 
298,125
 | 
 | 
 
 | 
 
 | 
 
 | 
| Redeemable noncontrolling interest | 
3,094
 | 
 | 
$ 3,160
 | 
3,302
 | 
 | 
3,466
 | 
$ 3,603
 | 
3,766
 | 
| Equity: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Common stock, $0.01 par value, 60,000,000 shares authorized; 21,419,462 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares | 
224
 | 
 | 
 
 | 
219
 | 
 | 
 
 | 
 
 | 
 
 | 
| Additional paid-in capital | 
449,687
 | 
 | 
 
 | 
447,298
 | 
 | 
 
 | 
 
 | 
 
 | 
| Retained earnings | 
17,282
 | 
 | 
 
 | 
18,285
 | 
 | 
 
 | 
 
 | 
 
 | 
| Treasury shares, at cost; 958,481 and 156,737 shares in 2019 and 2018, respectively | 
(8,531)
 | 
 | 
 
 | 
(2,476)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accumulated other comprehensive income, net of tax | 
0
 | 
 | 
 
 | 
110
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total equity | 
458,662
 | 
 | 
$ 458,885
 | 
463,436
 | 
 | 
$ 436,048
 | 
$ 445,716
 | 
$ 445,681
 | 
| Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 
764,884
 | 
 | 
 
 | 
764,863
 | 
 | 
 
 | 
 
 | 
 
 | 
| Allowance for doubtful accounts, trade receivables | 
$ 139
 | 
 | 
 
 | 
$ 261
 | 
 | 
 
 | 
 
 | 
 
 | 
| Common stock, par value (in dollars per share) | 
$ 0.01
 | 
 | 
 
 | 
$ 0.01
 | 
 | 
 
 | 
 
 | 
 
 | 
| Common stock, shares authorized (in shares) | 
60,000,000
 | 
 | 
 
 | 
60,000,000
 | 
 | 
 
 | 
 
 | 
 
 | 
| Common stock, shares outstanding (in shares) | 
21,419,462
 | 
 | 
 
 | 
21,765,404
 | 
 | 
 
 | 
 
 | 
 
 | 
| Treasury shares (in shares) | 
958,481
 | 
 | 
 
 | 
156,737
 | 
 | 
 
 | 
 
 | 
 
 | 
| Reportable Legal Entities | Parent | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current assets: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Cash and cash equivalents | 
$ 83,584
 | 
 | 
 
 | 
$ 48,396
 | 
 | 
 
 | 
 
 | 
 
 | 
| Receivables: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Trade, operating, net of allowance for doubtful accounts | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Trade, dry-leasing | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Tax receivables | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Inventories, net | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Prepaid expenses | 
756
 | 
 | 
 
 | 
398
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total current assets | 
84,340
 | 
 | 
 
 | 
48,794
 | 
 | 
 
 | 
 
 | 
 
 | 
| Property and equipment | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accumulated depreciation | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Property and equipment, net | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Operating lease right-of-use | 
0
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Equity investments and advances | 
 
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Investments in consolidated subsidiaries | 
181,684
 | 
 | 
 
 | 
172,950
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intangible assets | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Deferred income taxes | 
10,602
 | 
 | 
 
 | 
9,904
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intercompany receivables | 
317,076
 | 
 | 
 
 | 
366,541
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other assets | 
961
 | 
 | 
 
 | 
1,251
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total assets | 
594,663
 | 
 | 
 
 | 
599,440
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current liabilities: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accounts payable and accrued expenses | 
137
 | 
 | 
 
 | 
136
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued wages and benefits | 
5
 | 
 | 
 
 | 
43
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued interest | 
469
 | 
 | 
 
 | 
500
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued income taxes | 
918
 | 
 | 
 
 | 
918
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued other taxes | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued contingencies | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current portion of long-term debt | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other current liabilities | 
998
 | 
 | 
 
 | 
647
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total current liabilities | 
2,527
 | 
 | 
 
 | 
2,244
 | 
 | 
 
 | 
 
 | 
 
 | 
| Long-term debt | 
133,496
 | 
 | 
 
 | 
133,900
 | 
 | 
 
 | 
 
 | 
 
 | 
| Deferred income taxes | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intercompany payables | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Operating lease liabilities | 
0
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other liabilities | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total liabilities | 
136,023
 | 
 | 
 
 | 
136,144
 | 
 | 
 
 | 
 
 | 
 
 | 
| Redeemable noncontrolling interest | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Equity: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Common stock, $0.01 par value, 60,000,000 shares authorized; 21,419,462 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares | 
224
 | 
 | 
 
 | 
219
 | 
 | 
 
 | 
 
 | 
 
 | 
| Additional paid-in capital | 
449,688
 | 
 | 
 
 | 
447,299
 | 
 | 
 
 | 
 
 | 
 
 | 
| Retained earnings | 
17,259
 | 
 | 
 
 | 
18,254
 | 
 | 
 
 | 
 
 | 
 
 | 
| Treasury shares, at cost; 958,481 and 156,737 shares in 2019 and 2018, respectively | 
(8,531)
 | 
 | 
 
 | 
(2,476)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accumulated other comprehensive income, net of tax | 
 
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total equity | 
458,640
 | 
 | 
 
 | 
463,296
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 
594,663
 | 
 | 
 
 | 
599,440
 | 
 | 
 
 | 
 
 | 
 
 | 
| Reportable Legal Entities | Guarantors | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current assets: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Cash and cash equivalents | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Receivables: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Trade, operating, net of allowance for doubtful accounts | 
23,151
 | 
 | 
 
 | 
27,509
 | 
 | 
 
 | 
 
 | 
 
 | 
| Trade, dry-leasing | 
5,165
 | 
 | 
 
 | 
3,803
 | 
 | 
 
 | 
 
 | 
 
 | 
| Tax receivables | 
10
 | 
 | 
 
 | 
6
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other | 
16,336
 | 
 | 
 
 | 
1,949
 | 
 | 
 
 | 
 
 | 
 
 | 
| Inventories, net | 
20,962
 | 
 | 
 
 | 
20,633
 | 
 | 
 
 | 
 
 | 
 
 | 
| Prepaid expenses | 
1,778
 | 
 | 
 
 | 
1,219
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total current assets | 
67,402
 | 
 | 
 
 | 
55,119
 | 
 | 
 
 | 
 
 | 
 
 | 
| Property and equipment | 
902,246
 | 
 | 
 
 | 
900,611
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accumulated depreciation | 
(332,872)
 | 
 | 
 
 | 
(314,567)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Property and equipment, net | 
569,374
 | 
 | 
 
 | 
586,044
 | 
 | 
 
 | 
 
 | 
 
 | 
| Operating lease right-of-use | 
7,028
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Equity investments and advances | 
 
 | 
 | 
 
 | 
27,112
 | 
 | 
 
 | 
 
 | 
 
 | 
| Investments in consolidated subsidiaries | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intangible assets | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Deferred income taxes | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intercompany receivables | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other assets | 
5,421
 | 
 | 
 
 | 
20,231
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total assets | 
649,225
 | 
 | 
 
 | 
688,506
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current liabilities: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accounts payable and accrued expenses | 
11,375
 | 
 | 
 
 | 
11,357
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued wages and benefits | 
6,621
 | 
 | 
 
 | 
7,743
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued interest | 
67
 | 
 | 
 
 | 
69
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued income taxes | 
10
 | 
 | 
 
 | 
6
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued other taxes | 
1,034
 | 
 | 
 
 | 
768
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued contingencies | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current portion of long-term debt | 
1,663
 | 
 | 
 
 | 
1,663
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other current liabilities | 
1,438
 | 
 | 
 
 | 
220
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total current liabilities | 
22,208
 | 
 | 
 
 | 
21,826
 | 
 | 
 
 | 
 
 | 
 
 | 
| Long-term debt | 
25,485
 | 
 | 
 
 | 
26,317
 | 
 | 
 
 | 
 
 | 
 
 | 
| Deferred income taxes | 
116,285
 | 
 | 
 
 | 
117,015
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intercompany payables | 
253,989
 | 
 | 
 
 | 
310,727
 | 
 | 
 
 | 
 
 | 
 
 | 
| Operating lease liabilities | 
5,793
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other liabilities | 
850
 | 
 | 
 
 | 
720
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total liabilities | 
424,610
 | 
 | 
 
 | 
476,605
 | 
 | 
 
 | 
 
 | 
 
 | 
| Redeemable noncontrolling interest | 
3
 | 
 | 
 
 | 
3
 | 
 | 
 
 | 
 
 | 
 
 | 
| Equity: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Common stock, $0.01 par value, 60,000,000 shares authorized; 21,419,462 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Additional paid-in capital | 
100,307
 | 
 | 
 
 | 
100,306
 | 
 | 
 
 | 
 
 | 
 
 | 
| Retained earnings | 
124,305
 | 
 | 
 
 | 
111,482
 | 
 | 
 
 | 
 
 | 
 
 | 
| Treasury shares, at cost; 958,481 and 156,737 shares in 2019 and 2018, respectively | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accumulated other comprehensive income, net of tax | 
 
 | 
 | 
 
 | 
110
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total equity | 
224,612
 | 
 | 
 
 | 
211,898
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 
649,225
 | 
 | 
 
 | 
688,506
 | 
 | 
 
 | 
 
 | 
 
 | 
| Reportable Legal Entities | Non-guarantors | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current assets: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Cash and cash equivalents | 
4,846
 | 
 | 
 
 | 
2,357
 | 
 | 
 
 | 
 
 | 
 
 | 
| Receivables: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Trade, operating, net of allowance for doubtful accounts | 
7,342
 | 
 | 
 
 | 
5,797
 | 
 | 
 
 | 
 
 | 
 
 | 
| Trade, dry-leasing | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Tax receivables | 
2,670
 | 
 | 
 
 | 
3,181
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other | 
142
 | 
 | 
 
 | 
394
 | 
 | 
 
 | 
 
 | 
 
 | 
| Inventories, net | 
42
 | 
 | 
 
 | 
40
 | 
 | 
 
 | 
 
 | 
 
 | 
| Prepaid expenses | 
288
 | 
 | 
 
 | 
190
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total current assets | 
15,330
 | 
 | 
 
 | 
11,959
 | 
 | 
 
 | 
 
 | 
 
 | 
| Property and equipment | 
16,726
 | 
 | 
 
 | 
16,550
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accumulated depreciation | 
(3,953)
 | 
 | 
 
 | 
(3,400)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Property and equipment, net | 
12,773
 | 
 | 
 
 | 
13,150
 | 
 | 
 
 | 
 
 | 
 
 | 
| Operating lease right-of-use | 
1,052
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Equity investments and advances | 
 
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Investments in consolidated subsidiaries | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intangible assets | 
1,098
 | 
 | 
 
 | 
1,107
 | 
 | 
 
 | 
 
 | 
 
 | 
| Deferred income taxes | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intercompany receivables | 
171
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other assets | 
105
 | 
 | 
 
 | 
96
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total assets | 
30,529
 | 
 | 
 
 | 
26,312
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current liabilities: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accounts payable and accrued expenses | 
1,955
 | 
 | 
 
 | 
1,668
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued wages and benefits | 
1,596
 | 
 | 
 
 | 
1,481
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued interest | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued income taxes | 
10
 | 
 | 
 
 | 
49
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued other taxes | 
376
 | 
 | 
 
 | 
500
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued contingencies | 
647
 | 
 | 
 
 | 
630
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current portion of long-term debt | 
196
 | 
 | 
 
 | 
395
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other current liabilities | 
466
 | 
 | 
 
 | 
11
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total current liabilities | 
5,246
 | 
 | 
 
 | 
4,734
 | 
 | 
 
 | 
 
 | 
 
 | 
| Long-term debt | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Deferred income taxes | 
1,246
 | 
 | 
 
 | 
1,245
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intercompany payables | 
63,280
 | 
 | 
 
 | 
55,847
 | 
 | 
 
 | 
 
 | 
 
 | 
| Operating lease liabilities | 
594
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other liabilities | 
0
 | 
 | 
 
 | 
27
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total liabilities | 
70,366
 | 
 | 
 
 | 
61,853
 | 
 | 
 
 | 
 
 | 
 
 | 
| Redeemable noncontrolling interest | 
3,091
 | 
 | 
 
 | 
3,299
 | 
 | 
 
 | 
 
 | 
 
 | 
| Equity: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Common stock, $0.01 par value, 60,000,000 shares authorized; 21,419,462 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Additional paid-in capital | 
4,561
 | 
 | 
 
 | 
4,562
 | 
 | 
 
 | 
 
 | 
 
 | 
| Retained earnings | 
(47,489)
 | 
 | 
 
 | 
(43,402)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Treasury shares, at cost; 958,481 and 156,737 shares in 2019 and 2018, respectively | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accumulated other comprehensive income, net of tax | 
 
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total equity | 
(42,928)
 | 
 | 
 
 | 
(38,840)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 
30,529
 | 
 | 
 
 | 
26,312
 | 
 | 
 
 | 
 
 | 
 
 | 
| Eliminations | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current assets: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Cash and cash equivalents | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Receivables: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Trade, operating, net of allowance for doubtful accounts | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Trade, dry-leasing | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Tax receivables | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Inventories, net | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Prepaid expenses | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total current assets | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Property and equipment | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accumulated depreciation | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Property and equipment, net | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Operating lease right-of-use | 
0
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Equity investments and advances | 
 
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Investments in consolidated subsidiaries | 
(181,684)
 | 
 | 
 
 | 
(172,950)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intangible assets | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Deferred income taxes | 
(10,602)
 | 
 | 
 
 | 
(9,904)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intercompany receivables | 
(317,247)
 | 
 | 
 
 | 
(366,541)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other assets | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total assets | 
(509,533)
 | 
 | 
 
 | 
(549,395)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current liabilities: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accounts payable and accrued expenses | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued wages and benefits | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued interest | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued income taxes | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued other taxes | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accrued contingencies | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Current portion of long-term debt | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other current liabilities | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total current liabilities | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Long-term debt | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Deferred income taxes | 
(10,602)
 | 
 | 
 
 | 
(9,903)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Intercompany payables | 
(317,269)
 | 
 | 
 
 | 
(366,574)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Operating lease liabilities | 
0
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Other liabilities | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total liabilities | 
(327,871)
 | 
 | 
 
 | 
(376,477)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Redeemable noncontrolling interest | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Equity: | 
 
 | 
 | 
 
 | 
 
 | 
 | 
 
 | 
 
 | 
 
 | 
| Common stock, $0.01 par value, 60,000,000 shares authorized; 21,419,462 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Additional paid-in capital | 
(104,869)
 | 
 | 
 
 | 
(104,869)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Retained earnings | 
(76,793)
 | 
 | 
 
 | 
(68,049)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Treasury shares, at cost; 958,481 and 156,737 shares in 2019 and 2018, respectively | 
0
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Accumulated other comprehensive income, net of tax | 
 
 | 
 | 
 
 | 
0
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total equity | 
(181,662)
 | 
 | 
 
 | 
(172,918)
 | 
 | 
 
 | 
 
 | 
 
 | 
| Total liabilities, redeemable noncontrolling interest and stockholders’ equity | 
$ (509,533)
 | 
 | 
 
 | 
$ (549,395)
 | 
 | 
 
 | 
 
 | 
 
 | 
 | 
 |