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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)        
Operating revenues $ 24,076 $ 36,158 $ 75,240 $ 86,038
Operating costs:        
Operating expenses 25,324 31,215 66,180 69,974
General and administrative 5,049 3,842 9,593 7,925
Depreciation and amortization 5,325 7,392 11,406 16,070
Operating expenses, total 35,698 42,449 87,179 93,969
Loss from operations (11,622) (6,291) (11,939) (7,931)
Other income (expense):        
Interest income 151 73 293 110
Interest expense (122) (82) (280) (170)
Other income 226 463 422 414
Loss before income tax (11,367) (5,837) (11,504) (7,577)
Income tax benefit 121 126 121 157
Net loss (11,246) (5,711) (11,383) (7,420)
Other comprehensive income (loss):        
Net unrealized income (loss) on foreign exchange rate translation, net 174 (220) 383 (549)
Comprehensive loss $ (11,072) $ (5,931) $ (11,000) $ (7,969)
Basic loss per share of common stock $ (0.49) $ (0.25) $ (0.49) $ (0.32)
Diluted loss per share of common stock $ (0.49) $ (0.25) $ (0.49) $ (0.32)
Weighted average equivalent common shares outstanding 23,176,934 22,897,686 23,117,571 22,888,746
Weighted average equivalent common shares outstanding - assuming dilution 23,176,934 22,897,686 23,117,571 22,888,746