QUARTERLY FINANCIAL INFORMATION (UNAUDITED) - Footnotes (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Error Corrections and Prior Period Adjustments Restatement [Line Items] | |||||||||||
| Revenues | $ 52,016 | $ 54,610 | $ 57,728 | $ 57,322 | $ 57,531 | $ 61,385 | $ 57,878 | $ 54,527 | $ 221,676 | $ 231,321 | $ 247,228 |
| Operating income (loss) | (5,629) | 41,571 | (9,523) | 1,651 | (8,359) | (122,773) | (276) | (5,056) | 28,070 | (136,464) | (3,369) |
| Net income (loss) | (5,948) | 31,279 | (10,516) | (1,357) | 61,459 | (81,215) | (3,072) | (5,787) | $ 13,458 | $ (28,615) | $ (14,910) |
| Net income (loss) attributable to common shares | $ (5,794) | $ 31,289 | $ (10,379) | $ (1,194) | $ 61,694 | $ (81,448) | $ (2,787) | $ (5,620) | |||
| Earnings (loss) per common share - basic (in dollars per share) | $ (0.27) | $ 1.44 | $ (0.49) | $ (0.06) | $ 2.89 | $ (3.91) | $ (0.13) | $ (0.27) | $ 0.64 | $ (1.36) | $ (0.39) |
| Earnings (loss) per common share - diluted (in dollars per share) | $ (0.27) | $ 1.44 | $ (0.49) | $ (0.06) | $ 2.89 | $ (3.91) | $ (0.13) | $ (0.27) | $ 0.64 | $ (1.36) | $ (0.39) |
| Operating expenses | $ 151,523 | $ 167,446 | $ 169,863 | ||||||||
| Income tax benefit | 2,940 | (122,665) | (3,357) | ||||||||
| Gains on asset dispositions | 1,575 | 4,507 | 4,787 | ||||||||
| Interest expense | 15,131 | 16,763 | 17,325 | ||||||||
| Depreciation and amortization | $ 39,541 | $ 45,736 | $ 49,315 | ||||||||
| Correction of Error Related to Adjustments That Were Immaterial | |||||||||||
| Error Corrections and Prior Period Adjustments Restatement [Line Items] | |||||||||||
| Operating income (loss) | $ 300 | $ 1,200 | |||||||||
| Net income (loss) | 1,400 | 300 | |||||||||
| Operating expenses | 400 | 200 | |||||||||
| General and administrative epense | 100 | 700 | |||||||||
| Loss on impairment | 300 | ||||||||||
| Income tax benefit | 200 | $ 900 | |||||||||
| Gains on asset dispositions | 200 | ||||||||||
| Interest expense | 1,200 | ||||||||||
| Depreciation and amortization | $ 200 | ||||||||||
| Loss per common share (in usd per share) | $ 0.05 | $ 0.02 | |||||||||
| X | ||||||||||
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense. No definition available.
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- Definition The net result for the period of deducting operating expenses from operating revenues. No definition available.
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Details
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