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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