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Acquisitions - Pro Forma Information (Details) - Vitruvian - USD ($) $ / shares in Units, $ in Thousands | 10 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |
Revenue | $ 213,368 |  |
Pro forma revenue |  | $ 1,356,202 | $ 523,097
Pro forma net income (loss) |  | $ 448,398 | $ (1,190,481)
Pro forma earnings (loss) per share (basic) (usd per share) |  | $ 2.49 | $ (8.11)
Pro forma earnings (loss) per share (diluted) (usd per share) |  | $ 2.49 | $ (8.11)

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