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Schedule of Equity Method Investment, Financial Information, Statement of Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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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)

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