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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS        
Operating revenues $ 45,627 $ 28,122 $ 118,023 $ 103,263
Operating costs:        
Operating expenses 36,594 28,132 107,639 94,203
General and administrative 3,445 3,656 12,296 13,247
Depreciation and amortization 9,724 10,591 29,750 33,967
Operating expenses, total 49,763 42,379 149,685 141,417
Loss from operations (4,136) (14,257) (31,662) (38,154)
Other income (expense):        
Interest income 87 92 230 226
Interest expense (25) (71) (61) (239)
Other (expense) income (103) 263 136 1,829
Loss before income tax (4,177) (13,973) (31,357) (36,338)
Income tax benefit 1,418 1,557 4,635 3,733
Net loss (2,759) (12,416) (26,722) (32,605)
Other comprehensive income (loss):        
Net unrealized income (loss) on foreign exchange rate translation, net 395 (48) 750 422
Comprehensive loss $ (2,364) $ (12,464) $ (25,972) $ (32,183)
Basic loss per share attributable to common stock $ (0.13) $ (0.57) $ (1.23) $ (1.51)
Diluted loss per share attributable to common stock $ (0.13) $ (0.57) $ (1.23) $ (1.51)
Weighted average equivalent common shares outstanding 21,701,662 21,622,349 21,681,474 21,603,065
Weighted average equivalent common shares outstanding - assuming dilution 21,701,662 21,622,349 21,681,474 21,603,065