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Acquisitions (Pro Forma Summary of All Acquisitions) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Business Combinations [Abstract] |  |  |  |
Revenue | $ 2,502,299 | $ 2,452,886 | $ 4,838,047 | $ 4,735,415
Net income | $ 53,380 | $ 54,019 | $ 104,546 | $ 96,687
Basic net income per share (in dollars per share) | $ 2.13 | $ 2.12 | $ 4.16 | $ 3.77
Diluted net income per share (in dollars per share) | $ 2.13 | $ 2.12 | $ 4.15 | $ 3.75

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