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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS    
Operating revenues $ 41,927,000 $ 47,055,000
Operating costs:    
Operating expenses 39,537,000 40,081,000
General and administrative 4,355,000 5,560,000
Depreciation and amortization 10,176,000 12,045,000
Operating expenses, total 54,068,000 57,686,000
Loss from operations (12,141,000) (10,631,000)
Other income (expense):    
Interest income 80,000 64,000
Interest expense (22,000) (96,000)
Other income 106,000 1,095,000
Loss before income tax (11,977,000) (9,568,000)
Income tax benefit 2,823,000 968,000
Net loss (9,154,000) (8,600,000)
Other comprehensive income:    
Net unrealized income on foreign exchange rate translation, net 97,000 719,000
Comprehensive loss $ (9,057,000) $ (7,881,000)
Basic loss per share attributable to common stock $ (0.42) $ (0.40)
Diluted loss per share attributable to common stock $ (0.42) $ (0.40)
Weighted average equivalent common shares outstanding 21,659,539 21,629,817
Weighted average equivalent common shares outstanding - assuming dilution 21,659,539 21,629,817