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Acquisitions - Pro Forma Information Operations as Acquisition of NTA (Details) - NTA - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |
Total revenues | $ 1,507,352 | $ 1,339,896
Total expenses | 1,259,213 | 1,288,690
Income before income taxes | 248,139 | 51,206
Net income | $ 193,755 | $ 43,373
Earnings Per Share, Pro Forma [Abstract] |  |
Basic (in usd per share) | $ 4.64 | $ 1.04
Diluted (in usd per share) | $ 4.62 | $ 1.04

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