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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS        
Operating revenues $ 28,122,000 $ 62,498,000 $ 103,263,000 $ 179,555,000
Operating costs:        
Operating expenses 28,132,000 50,195,000 94,203,000 158,385,000
General and administrative 3,656,000 4,999,000 13,247,000 18,142,000
Depreciation and amortization 10,591,000 11,966,000 33,967,000 35,569,000
Operating expenses, total 42,379,000 67,160,000 141,417,000 212,096,000
Loss from operations (14,257,000) (4,662,000) (38,154,000) (32,541,000)
Other income (expense):        
Interest income 92,000 35,000 226,000 84,000
Interest expense (71,000) (155,000) (239,000) (492,000)
Other income (expense) 263,000 502,000 1,829,000 515,000
Loss before income tax (13,973,000) (4,280,000) (36,338,000) (32,434,000)
Income tax benefit 1,557,000 1,410,000 3,733,000 11,095,000
Net loss (12,416,000) (2,870,000) (32,605,000) (21,339,000)
Other comprehensive (loss) income:        
Net unrealized (loss) income on foreign exchange rate translation, net (48,000) (890,000) 422,000 (964,000)
Comprehensive loss $ (12,464,000) $ (3,760,000) $ (32,183,000) $ (22,303,000)
Basic loss per share attributable to common stock $ (0.57) $ (0.13) $ (1.51) $ (1.05)
Diluted loss per share attributable to common stock $ (0.57) $ (0.13) $ (1.51) $ (1.05)
Weighted average equivalent common shares outstanding 21,622,349 21,571,513 21,603,065 20,386,202
Weighted average equivalent common shares outstanding-assuming dilution 21,622,349 21,571,513 21,603,065 20,386,202