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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)      
Operating revenues $ 145,773,000 $ 154,156,000 $ 156,532,000
Operating costs:      
Operating expenses 123,024,000 132,937,000 139,072,000
General and administrative 17,169,000 16,287,000 16,189,000
Depreciation and amortization 21,826,000 29,959,000 39,235,000
Total cost and expenses 162,019,000 179,183,000 194,496,000
Loss from operations (16,246,000) (25,027,000) (37,964,000)
Other income (expense):      
Interest income 548,000 400,000 306,000
Interest expense (435,000) (408,000) (158,000)
Other income (expense) 681,000 (170,000) 712,000
Loss before income tax (15,452,000) (25,205,000) (37,104,000)
Income tax benefit (expense)      
Current 216,000 41,000 6,077,000
Deferred 23,000 757,000 (763,000)
Total income tax benefit 239,000 798,000 5,314,000
Net loss (15,213,000) (24,407,000) (31,790,000)
Other comprehensive income (loss):      
Net unrealized income (loss) on foreign exchange rate translation, net 392,000 (1,141,000) 816,000
Comprehensive loss $ (14,821,000) $ (25,548,000) $ (30,974,000)
Basic loss per share of common stock $ (0.66) $ (1.07) $ (1.40)
Diluted loss per share of common stock $ (0.66) $ (1.07) $ (1.40)
Weighted average equivalent common shares outstanding 23,179,257 22,912,217 22,779,377
Weighted average equivalent common shares outstanding - assuming dilution 23,179,257 22,912,217 22,779,377