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Acquisitions And Divestitures - Pro Forma Information (Details) - Vitruvian - USD ($) $ / shares in Units, $ in Thousands | 10 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Revenue | $ 213,368 |
Pro forma revenue |  | $ 1,356,202
Business Acquisition, Pro Forma Net Income (Loss) |  | $ 448,398
Pro forma earnings per share (basic) (in dollars per share) |  | $ 2.49
Pro forma earnings per share (diluted) (in dollars per share) |  | $ 2.49

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