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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS      
Operating revenues $ 157,148 $ 133,330 $ 234,685
Operating costs:      
Operating expenses 139,164 121,661 205,566
General and administrative 16,189 16,822 22,729
Depreciation and amortization 39,235 44,283 47,072
Operating expenses, total 194,588 182,766 275,367
Loss from operations (37,440) (49,436) (40,682)
Other income (expense):      
Interest income 306 347 159
Interest expense (158) (260) (609)
Other income 712 3,108 1,098
Loss before income tax (36,580) (46,241) (40,034)
Income tax benefit (expense):      
Current 6,077 396 (291)
Deferred (763) 6,053 14,046
Total income tax benefit (expense) 5,314 6,449 13,755
Net loss (31,266) (39,792) (26,279)
Other comprehensive income (loss):      
Net unrealized income (loss) on foreign exchange rate translation, net 816 228 (1,480)
Comprehensive loss $ (30,450) $ (39,564) $ (27,759)
Basic loss per share attributable to common stock $ (1.44) $ (1.84) $ (1.27)
Diluted loss per share attributable to common stock $ (1.44) $ (1.84) $ (1.27)
Weighted average equivalent common shares outstanding 21,694,645 21,611,562 20,688,185
Weighted average equivalent common shares outstanding - assuming dilution 21,694,645 21,611,562 20,688,185