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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)    
Operating revenues $ 51,164 $ 49,880
Operating costs:    
Operating expenses 40,856 38,759
General and administrative 4,544 4,083
Depreciation and amortization 6,081 8,678
Operating expenses, total 51,481 51,520
Loss from operations (317) (1,640)
Other income (expense):    
Interest income 142 37
Interest expense (158) (88)
Other income (expense) 196 (49)
Loss before income tax (137) (1,740)
Income tax benefit   31
Net loss (137) (1,709)
Other comprehensive income (loss):    
Net unrealized income (loss) on foreign exchange rate translation, net 209 (329)
Comprehensive income (loss) $ 72 $ (2,038)
Basic loss per share of common stock $ (0.01) $ (0.07)
Diluted loss per share of common stock $ (0.01) $ (0.07)
Weighted average equivalent common shares outstanding 23,057,546 22,879,805
Weighted average equivalent common shares outstanding - assuming dilution 23,057,546 22,879,805