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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS    
Operating revenues $ 49,880 $ 42,366
Operating costs:    
Operating expenses 38,759 39,974
General and administrative 4,083 4,355
Depreciation and amortization 8,678 10,176
Operating expenses, total 51,520 54,505
Loss from operations (1,640) (12,139)
Other (expense) income:    
Interest income 37 80
Interest expense (88) (22)
Other (expense) income (49) 106
Loss before income tax (1,740) (11,975)
Income tax benefit 31 2,823
Net loss (1,709) (9,152)
Other comprehensive (loss) income:    
Net unrealized (loss) income on foreign exchange rate translation, net (329) 97
Comprehensive loss $ (2,038) $ (9,055)
Basic loss per share of common stock $ (0.07) $ (0.40)
Diluted loss per share of common stock $ (0.07) $ (0.40)
Weighted average equivalent common shares outstanding 22,879,805 22,742,516
Weighted average equivalent common shares outstanding - assuming dilution 22,879,805 22,742,516