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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS    
Operating revenues $ 47,055,000 $ 73,722,000
Operating costs:    
Operating expenses 40,081,000 64,791,000
General and administrative 5,560,000 7,522,000
Depreciation and amortization 12,045,000 11,223,000
Operating expenses, total 57,686,000 83,536,000
Loss from operations (10,631,000) (9,814,000)
Other income (expense):    
Interest income 64,000 24,000
Interest expense (96,000) (147,000)
Other income 1,095,000 32,000
Loss before income tax (9,568,000) (9,905,000)
Income tax benefit    
Income tax benefit 968,000 3,313,000
Net loss (8,600,000) (6,592,000)
Other comprehensive gain (loss):    
Net unrealized gain (loss) on foreign exchange rate translation, net of tax 719,000 (418,000)
Comprehensive loss $ (7,881,000) $ (7,010,000)
Basic loss per share attributable to common stock $ (0.40) $ (0.37)
Diluted loss per share attributable to common stock $ (0.40) $ (0.37)
Weighted average equivalent common shares outstanding 21,629,817 18,021,366
Weighted average equivalent common shares outstanding-assuming dilution 21,629,817 18,021,366