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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)        
Operating revenues $ 36,976 $ 40,448 $ 112,216 $ 126,486
Operating costs:        
Operating expenses 26,030 34,419 92,210 104,393
General and administrative 3,797 4,136 13,390 12,061
Depreciation and amortization 5,238 7,127 16,644 23,197
Operating expenses, total 35,065 45,682 122,244 139,651
Income (loss) from operations 1,911 (5,234) (10,028) (13,165)
Other income (expense):        
Interest income 152 147 445 257
Interest expense (101) (74) (381) (244)
Other income (expense) 11 (242) 433 172
Income (loss) before income tax 1,973 (5,403) (9,531) (12,980)
Income tax benefit 25 232 146 389
Net income (loss) 1,998 (5,171) (9,385) (12,591)
Other comprehensive (loss) income:        
Net unrealized (loss) income on foreign exchange rate translation, net (103) 216 280 (333)
Comprehensive income (loss) $ 1,895 $ (4,955) $ (9,105) $ (12,924)
Basic income (loss) per share of common stock $ 0.09 $ (0.23) $ (0.41) $ (0.55)
Diluted income (loss) per share of common stock $ 0.09 $ (0.23) $ (0.41) $ (0.55)
Weighted average equivalent common shares outstanding 23,222,045 22,926,764 23,152,776 22,901,558
Weighted average equivalent common shares outstanding - assuming dilution 23,337,903 22,926,764 23,152,776 22,901,558