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Acquisitions - Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue from continuing operations [Abstract]                      
Revenue $ 1,808,950 $ 1,747,403 $ 1,798,094 $ 1,637,671 $ 1,752,530 $ 1,747,775 $ 1,737,371 $ 1,583,210 $ 6,992,118 $ 6,820,886 $ 6,043,224
Pro forma                 6,992,434 6,858,255  
Earnings from continuing operations [Abstract]                      
As reported $ 157,975 $ 157,305 $ 166,456 $ 109,409 $ 289,645 $ 159,455 $ 142,475 $ 155,088 591,145 746,663 $ 502,128
Pro forma                 $ 594,786 $ 747,537  
Basic earnings per share from continuing operations [Abstract]                      
As reported (in dollars per share) $ 1.08 $ 1.07 $ 1.10 $ 0.71 $ 1.86 $ 1.02 $ 0.92 $ 1.00 $ 3.94 $ 4.80 $ 3.23
Pro forma (in dollars per share)                 3.97 4.80  
Diluted earnings per share from continuing operations [Abstract]                      
As reported (in dollars per share) $ 1.07 $ 1.05 $ 1.08 $ 0.70 $ 1.83 $ 1.01 $ 0.90 $ 0.99 3.89 4.73 $ 3.21
Pro forma (in dollars per share)                 $ 3.91 $ 4.74