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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Income Statement [Abstract] |  |  |  |
Revenue | $ 49,884 | $ 65,384 | $ 133,745 | $ 230,864
Cost of revenue | 50,378 | 60,125 | 150,755 | 205,839
Gross profit (loss) | (494) | 5,259 | (17,010) | 25,025
General and administrative expenses | 4,370 | 5,086 | 12,940 | 14,633
Asset impairment | 0 | 0 | 389 | 0
Operating income (loss) | (4,864) | 173 | (30,339) | 10,392
Other income (expense): |  |  |  |
Interest expense | (45) | (110) | (262) | (248)
Interest income | 0 | 12 | 12 | 20
Other income (expense), net | 38 | 599 | (221) | 1,039
Total other income (expense) | (7) | 501 | (471) | 811
Net income (loss) before income taxes | (4,871) | 674 | (30,810) | 11,203
Income tax expense (benefit) | (1,761) | 133 | (10,322) | 4,134
Net income (loss) | $ (3,110) | $ 541 | $ (20,488) | $ 7,069
Per share data: |  |  |  |
Basic and diluted earnings (loss) per share - common shareholders (usd per share) | $ (0.21) | $ 0.04 | $ (1.38) | $ 0.48
Cash dividend declared per common share (usd per share) | $ 0.01 | $ 0.01 | $ 0.03 | $ 0.03

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