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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, 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