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Consolidated Statements of Income (Loss) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 217,371 | $ 205,375 | $ 196,982 | $ 167,410 | $ 211,133 | $ 204,744 | $ 166,665 | $ 134,610 | $ 787,138 | $ 717,152 | $ 651,227
Cost of revenues |  |  |  |  |  |  |  |  | 613,526 | 572,994 | 516,883
Gross profit | 49,201 | 46,162 | 42,776 | 35,473 | 41,459 | 41,367 | 35,408 | 25,924 | 173,612 | 144,158 | 134,344
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 114,513 | 107,570 | 110,568
Operating income |  |  |  |  |  |  |  |  | 59,099 | 36,588 | 23,776
Other expenses, net (Note 16) |  |  |  |  |  |  |  |  | 16,709 | 7,871 | 7,409
Income before (benefit) provision for income taxes |  |  |  |  |  |  |  |  | 42,390 | 28,717 | 16,367
Income tax (benefit) provision |  |  |  |  |  |  |  |  | 4,813 | (4,791) | 4,370
Net income |  |  |  |  |  |  |  |  | 37,577 | 33,508 | 11,997
Net loss attributable to redeemable non-controlling interest |  |  |  |  |  |  |  |  | 407 | 3,983 | 35
Net income attributable to common shareholders | $ 11,593 | $ 10,701 | $ 8,702 | $ 6,988 | $ 23,811 | $ 8,493 | $ 5,831 | $ (644) | $ 37,984 | $ 37,491 | $ 12,032
Net income per share attributable to common shareholders: |  |  |  |  |  |  |  |  |  |  |
Basic (in usd per share) | $ 0.25 | $ 0.23 | $ 0.19 | $ 0.15 | $ 0.52 | $ 0.19 | $ 0.13 | $ (0.01) | $ 0.83 | $ 0.82 | $ 0.26
Diluted (in usd per share) | $ 0.24 | $ 0.23 | $ 0.19 | $ 0.15 | $ 0.52 | $ 0.19 | $ 0.13 | $ (0.01) | $ 0.81 | $ 0.82 | $ 0.26
Weighted average common shares outstanding: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 46,114 | 45,854 | 45,470 | 45,373 | 45,537 | 45,524 | 45,463 | 45,514 | 45,729 | 45,509 | 46,409
Diluted (in shares) | 47,327 | 46,944 | 46,406 | 45,994 | 45,957 | 45,771 | 45,675 | 45,514 | 46,831 | 45,748 | 46,493

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