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Acquisition of Tokio Millennium Re (Overview) (Details) - TMR Group Entities - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 22, 2019 | Jun. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |  |
Net purchase price | $ 1,563,593 |  |  |  |
Corporate expenses associated with the acquisition |  | $ 40,003 | $ 14,488 | $ 25,500 | $ 40,000
Compensation-related costs |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Corporate expenses associated with the acquisition |  | 15,861 | 9,187 |  |
Transaction-related costs |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Corporate expenses associated with the acquisition |  | 14,838 | 1,946 |  |
Integration-related costs |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Corporate expenses associated with the acquisition |  | $ 9,304 | $ 3,355 |  |

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