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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Combinations [Abstract] |  |  |  |
Revenue | $ 3,091,952 | $ 3,118,676 | $ 9,048,379 | $ 9,024,723
Net income | $ 93,107 | $ 52,452 | $ 204,526 | $ 161,614
Basic net income per share (in dollars per share) | $ 3.85 | $ 2.10 | $ 8.29 | $ 6.44
Diluted net income per share (in dollars per share) | $ 3.84 | $ 2.09 | $ 8.26 | $ 6.42

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