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Acquisitions (Pro Forma Summary of All Acquisitions) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Business Combinations [Abstract] |  |  |  |
Revenue | $ 3,101,600 | $ 3,054,987 | $ 5,956,427 | $ 5,906,047
Net income | $ 60,678 | $ 56,126 | $ 111,419 | $ 109,162
Basic net income per share (in dollars per share) | $ 2.45 | $ 2.24 | $ 4.47 | $ 4.35
Diluted net income per share (in dollars per share) | $ 2.44 | $ 2.24 | $ 4.45 | $ 4.34

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