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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS        
Operating revenues $ 40,448 $ 45,108 $ 126,486 $ 119,114
Operating costs:        
Operating expenses 34,419 36,238 104,393 109,010
General and administrative 4,136 3,445 12,061 12,296
Depreciation and amortization 7,127 9,724 23,197 29,750
Operating expenses, total 45,682 49,407 139,651 151,056
Loss from operations (5,234) (4,299) (13,165) (31,942)
Other income (expense):        
Interest income 147 87 257 230
Interest expense (74) (25) (244) (61)
Other (expense) income (242) (103) 172 136
Loss before income tax (5,403) (4,340) (12,980) (31,637)
Income tax benefit 232 1,418 389 4,635
Net loss (5,171) (2,922) (12,591) (27,002)
Other comprehensive income (loss):        
Net unrealized income (loss) on foreign exchange rate translation, net 216 395 (333) 750
Comprehensive loss $ (4,955) $ (2,527) $ (12,924) $ (26,252)
Basic loss per share of common stock $ (0.23) $ (0.13) $ (0.55) $ (1.19)
Diluted loss per share of common stock $ (0.23) $ (0.13) $ (0.55) $ (1.19)
Weighted average equivalent common shares outstanding 22,926,764 22,786,745 22,901,558 22,765,548
Weighted average equivalent common shares outstanding - assuming dilution 22,926,764 22,786,745 22,901,558 22,765,548