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Business Acquisitions and Divestitures - Pro Forma Information (Details) - Deltek - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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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

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