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Acquisition of Tokio Millennium Re (Schedule of Identifiable Intangible Assets) (Details) - TMR - USD ($) $ in Thousands |  | 12 Months Ended | 21 Months Ended
--- | --- | --- | ---
Mar. 22, 2019 | Dec. 31, 2020 | Dec. 31, 2020
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |  |
Accumulated amortization (from March 22, 2019 through December 31, 2020), net of foreign exchange |  |  | $ 1,715
Impairment loss |  | $ 6,800 |
Net identifiable intangible assets related to the acquisition of TMR at December 31, 2020 | $ 18,000 | 9,485 | $ 9,485
Economic Useful Life | 10 years 6 months |  |
Insurance licenses |  |  |
Business Acquisition [Line Items] |  |  |
Intangible assets acquired | $ 6,800 |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |  |
Impairment loss |  | $ 6,800 |
Top broker relationships |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable finite lived intangible assets (top broker relationships and renewal rights) | $ 10,000 |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |  |
Economic Useful Life | 10 years |  |
Renewal rights |  |  |
Business Acquisition [Line Items] |  |  |
Identifiable finite lived intangible assets (top broker relationships and renewal rights) | $ 1,200 |  |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |  |
Economic Useful Life | 15 years |  |

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