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Selected Quarterly Data Summary of Selected Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,748,919 | $ 1,831,732 | $ 1,838,070 | $ 1,773,912 | $ 1,684,131 | $ 1,721,024 | $ 1,709,132 | $ 1,625,777 | $ 7,192,633 | $ 6,740,064 | $ 5,062,528
Gross margin | 697,327 | 712,779 | 723,944 | 699,479 | 664,559 | 664,411 | 671,059 | 651,884 | 2,833,529 | 2,651,913 | 2,075,402
Operating income | 151,671 | 166,745 | 200,285 | 185,926 | 146,250 | 156,188 | 173,596 | 173,834 | 704,627 | 649,868 | 530,180
Net income | $ 95,060 | $ 101,346 | $ 119,722 | $ 107,095 | $ 80,469 | $ 91,515 | $ 104,882 | $ 104,653 | $ 423,223 | $ 381,519 | $ 311,623
Basic earnings per share | $ 0.31 | $ 0.33 | $ 0.39 | $ 0.35 | $ 0.27 | $ 0.30 | $ 0.35 | $ 0.35 |  |  |
Diluted earnings per share | $ 0.31 | $ 0.33 | $ 0.39 | $ 0.35 | $ 0.26 | $ 0.30 | $ 0.34 | $ 0.34 |  |  |

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