Annual report pursuant to Section 13 and 15(d)

Acquisitions And Divestitures - Pro Forma Information (Details)

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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