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Unaudited Quarterly Financial Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 620,884 | $ 629,401 | $ 608,088 | $ 582,040 | $ 577,517 | $ 572,123 | $ 485,323 | $ 430,045 | $ 2,440,413 | $ 2,065,008 | $ 1,724,741
Gross profit | 198,195 | 207,120 | 202,086 | 187,782 | 192,932 | 191,404 | 158,534 | 135,875 | 795,183 | 678,745 | 557,435
Income from continuing operations | 24,060 | 29,775 | 26,013 | 17,348 | 19,173 | 24,891 | 14,335 | 13,023 | 97,196 | 71,422 | 73,495
Net income | $ 24,028 | $ 29,768 | $ 26,004 | $ 17,401 | $ 19,338 | $ 24,925 | $ 14,252 | $ 39,135 | $ 97,201 | $ 97,650 | $ 77,184
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 0.45 | $ 0.56 | $ 0.49 | $ 0.33 | $ 0.36 | $ 0.47 | $ 0.28 | $ 0.25 | $ 1.83 | $ 1.37 | $ 1.38
Discontinued operations | 0.00 | 0.00 | 0.00 | 0.00 | 0.01 | 0.00 | (0.01) | 0.51 | 0.00 | 0.50 | 0.06
Net income | 0.45 | 0.56 | 0.49 | 0.33 | 0.37 | 0.47 | 0.27 | 0.76 | 1.83 | 1.87 | 1.44
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Continuing operations | 0.45 | 0.55 | 0.48 | 0.32 | 0.36 | 0.47 | 0.27 | 0.25 | 1.81 | 1.35 | 1.35
Discontinued operations | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | 0.50 | 0.00 | 0.49 | 0.07
Net income | $ 0.45 | $ 0.55 | $ 0.48 | $ 0.32 | $ 0.36 | $ 0.47 | $ 0.27 | $ 0.75 | $ 1.81 | $ 1.84 | $ 1.42
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Income from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  | $ 5 | $ 525 | $ 3,689
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Income from discontinued operations, net of income taxes | $ (32) | $ (7) | $ (9) | $ 53 | $ 165 | $ 34 | $ (83) | $ 26,112 | $ 5 | $ 26,228 |

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