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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS        
Operating revenues $ 36,158 $ 31,640 $ 86,038 $ 74,006
Operating costs:        
Operating expenses 31,215 32,798 69,974 72,772
General and administrative 3,842 4,496 7,925 8,851
Depreciation and amortization 7,392 9,850 16,070 20,026
Operating expenses, total 42,449 47,144 93,969 101,649
Loss from operations (6,291) (15,504) (7,931) (27,643)
Other income (expense):        
Interest income 73 63 110 143
Interest expense (82) (14) (170) (36)
Other income 463 133 414 239
Loss before income tax (5,837) (15,322) (7,577) (27,297)
Income tax benefit 126 394 157 3,217
Net loss (5,711) (14,928) (7,420) (24,080)
Other comprehensive (loss) income:        
Net unrealized (loss) income on foreign exchange rate translation, net (220) 258 (549) 355
Comprehensive loss $ (5,931) $ (14,670) $ (7,969) $ (23,725)
Basic loss per share of common stock $ (0.25) $ (0.66) $ (0.32) $ (1.06)
Diluted loss per share of common stock $ (0.25) $ (0.66) $ (0.32) $ (1.06)
Weighted average equivalent common shares outstanding 22,897,686 22,766,894 22,888,746 22,754,772
Weighted average equivalent common shares outstanding - assuming dilution 22,897,686 22,766,894 22,888,746 22,754,772