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Acquisition of Tokio Millennium Re (Overview) (Details) - TMR Group Entities - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 22, 2019
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Business Acquisition [Line Items] |  |
Net purchase price |  | $ 1,563,593
Corporate expenses associated with the acquisition | $ 25,500 |
Transaction-related costs |  |
Business Acquisition [Line Items] |  |
Corporate expenses associated with the acquisition | 12,900 |
Integration-related costs |  |
Business Acquisition [Line Items] |  |
Corporate expenses associated with the acquisition | 5,900 |
Compensation-related costs |  |
Business Acquisition [Line Items] |  |
Corporate expenses associated with the acquisition | $ 6,700 |

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