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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)        
Operating revenues $ 29,499 $ 24,076 $ 68,478 $ 75,240
Operating costs:        
Operating expenses 19,732 25,324 48,748 66,180
General and administrative 4,261 5,049 7,935 9,593
Depreciation and amortization 4,383 5,325 9,287 11,406
Total cost and expenses 28,376 35,698 65,970 87,179
Income (loss) from operations 1,123 (11,622) 2,508 (11,939)
Other income (expense):        
Interest income 115 151 220 293
Interest expense (30) (122) (70) (280)
Other income (expense), net 293 226 (165) 422
Income (loss) before income tax 1,501 (11,367) 2,493 (11,504)
Income tax (expense) benefit (1) 121   121
Net income (loss) 1,500 (11,246) 2,493 (11,383)
Other comprehensive income (loss):        
Net unrealized income (loss) on foreign exchange rate translation, net 604 174 (595) 383
Comprehensive income (loss) $ 2,104 $ (11,072) $ 1,898 $ (11,000)
Basic income (loss) per share of common stock $ 0.06 $ (0.49) $ 0.11 $ (0.49)
Diluted income (loss) per share of common stock $ 0.06 $ (0.49) $ 0.11 $ (0.49)
Weighted average equivalent common shares outstanding 23,339,644 23,176,934 23,313,383 23,117,571
Weighted average equivalent common shares outstanding - assuming dilution 23,548,253 23,176,934 23,500,109 23,117,571