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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income Statement [Abstract] |  |  |  |
Revenue | $ 45,868 | $ 81,502 | $ 83,860 | $ 165,481
Cost of revenue | 57,488 | 67,436 | 100,378 | 145,714
Gross profit (loss) | (11,620) | 14,066 | (16,518) | 19,767
General and administrative expenses | 4,640 | 5,062 | 8,570 | 9,547
Asset impairment | 0 | 0 | 389 | 0
Operating income (loss) | (16,260) | 9,004 | (25,477) | 10,220
Other income (expense): |  |  |  |
Interest expense | (158) | (88) | (217) | (138)
Interest income | 12 | 2 | 12 | 8
Other income (expense), net | (266) | 42 | (257) | 440
Total other income (expense) | (412) | (44) | (462) | 310
Net income (loss) before income taxes | (16,672) | 8,960 | (25,939) | 10,530
Income tax expense (benefit) | (5,749) | 3,420 | (8,561) | 4,001
Net income (loss) | $ (10,923) | $ 5,540 | $ (17,378) | $ 6,529
Per share data: |  |  |  |
Basic and diluted earnings (loss) per share - common shareholders (usd per share) | $ (0.73) | $ 0.37 | $ (1.17) | $ 0.44
Cash dividend declared per common share (usd per share) | $ 0.01 | $ 0.01 | $ 0.02 | $ 0.02

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