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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS      
Operating revenues $ 154,156,000 $ 156,532,000 $ 137,640,000
Operating costs:      
Operating expenses 132,937,000 139,072,000 124,023,000
General and administrative 16,287,000 16,189,000 16,822,000
Depreciation and amortization 29,959,000 39,235,000 44,283,000
Operating expenses, total 179,183,000 194,496,000 185,128,000
Loss from operations (25,027,000) (37,964,000) (47,488,000)
Other income (expense):      
Interest income 400,000 306,000 347,000
Interest expense (408,000) (158,000) (260,000)
Other (expense) income (170,000) 712,000 3,108,000
Loss before income tax (25,205,000) (37,104,000) (44,293,000)
Income tax benefit (expense):      
Current 41,000 6,077,000 396,000
Deferred 757,000 (763,000) 5,564,000
Total income tax benefit 798,000 5,314,000 5,960,000
Net loss (24,407,000) (31,790,000) (38,333,000)
Other comprehensive (loss) income:      
Net unrealized (loss) income on foreign exchange rate translation, net (1,141,000) 816,000 228,000
Comprehensive loss $ (25,548,000) $ (30,974,000) $ (38,105,000)
Basic loss per share of common stock $ (1.07) $ (1.40) $ (1.69)
Diluted loss per share of common stock (1.07) (1.40) (1.69)
Cash dividend declared per share of common stock
Weighted average equivalent common shares outstanding 22,912,217 22,779,377 22,692,139
Weighted average equivalent common shares outstanding - assuming dilution 22,912,217 22,779,377 22,692,139