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Acquisitions (Pro Forma Summary of All Acquisitions) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Business Combinations [Abstract] |  |  |  |
Revenue | $ 2,773,082 | $ 2,792,994 | $ 8,032,963 | $ 7,941,561
Net income | $ 53,488 | $ 59,925 | $ 164,938 | $ 163,473
Basic net income per share (in dollars per share) | $ 2.14 | $ 2.38 | $ 6.57 | $ 6.41
Diluted net income per share (in dollars per share) | $ 2.13 | $ 2.37 | $ 6.56 | $ 6.39

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