Annual report pursuant to Section 13 and 15(d)

Schedule of Equity Method Investment, Financial Information, Statement of Operations (Details)

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Schedule of Equity Method Investment, Financial Information, Statement of Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dart Holding Company Ltd.    
Schedule of Equity Method Investments [Line Items]    
Operating revenues $ 45,602 $ 42,891
Operating and administrative 36,592 35,983
Depreciation and amortization 1,754 1,603
Total costs and expenses 38,346 37,586
Operating income 7,256 5,305
Net income 4,912 3,603
Other Investments    
Schedule of Equity Method Investments [Line Items]    
Operating revenues 170 581
Operating and administrative 63 367
Depreciation and amortization 377 503
Total costs and expenses 440 870
Operating income (270) (289)
Net income $ (442) $ (527)