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Business Acquisitions and Divestitures - Pro Forma Information (Details) - Deltek - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Net revenues $ 4,268,052 $ 4,012,030
Net income $ 656,404 $ 647,089
Earnings per share, basic (in dollars per share) $ 6.48 $ 6.43
Earnings per share, diluted (in dollars per share) $ 6.41 $ 6.37