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Collateralized Reinsurance And Trust Agreements (Narrative) (Details) $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 08, 2021 USD ($) | Dec. 12, 2019 USD ($) Item | Apr. 30, 2018 USD ($) Item | Apr. 01, 2018 USD ($) | Apr. 13, 2017 USD ($) Item | Dec. 01, 2015 USD ($) Item | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Amount on deposit in trust accounts |  |  |  |  |  |  | $ 1,293,107 |  |
Preferred shares |  |  |  |  |  |  |  |  |
Reinsurance coverage amount |  |  |  |  |  |  | $ 99,110 | $ 110,188 |
Catastrophe Reinsurance Agreement 3 [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount |  |  |  |  | $ 325,000 |  |  |  |
Catastrophe Reinsurance Agreement 4 [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount |  |  |  |  | 50,000 |  |  |  |
Catastrophe Reinsurance Agreement 5 [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount |  |  |  |  | 75,000 |  |  |  |
Catastrophe Reinsurance Agreement 6 [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount |  |  |  |  | $ 175,000 |  |  |  |
Catastrophe Reinsurance Series 2015-1 Notes [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Catastrophe reinsurance bonds funded amount |  |  |  |  |  | $ 625,000 |  |  |
Kilimanjaro Re Limited [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Number of collateralized reinsurance agreements | Item |  |  |  |  | 6 | 2 |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Number of collateralized reinsurance agreements | Item |  | 4 | 4 |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 And 2 [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Number of collateralized reinsurance agreements | Item |  | 2 | 2 |  |  |  |  |  |
Reinsurance contract term |  | 4 years | 4 years |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 Through 3 [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Number of collateralized reinsurance agreements | Item |  |  |  |  | 3 |  |  |  |
Reinsurance contract term |  |  |  |  | 4 years |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 Through 3 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance contract term | 4 years |  |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 3 And 4 [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Number of collateralized reinsurance agreements | Item |  | 2 | 2 |  |  |  |  |  |
Reinsurance contract term |  | 5 years | 5 years |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 4 Through 6 [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Number of collateralized reinsurance agreements | Item |  |  |  |  | 3 |  |  |  |
Reinsurance contract term |  |  |  |  | 5 years |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 4 Through 6 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance contract term | 5 years |  |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount |  | $ 150,000 | $ 62,500 |  | $ 225,000 | $ 300,000 |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 1 [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount | $ 150,000 |  |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 2 [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount |  | 275,000 | 200,000 |  | 400,000 | $ 325,000 |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 2 [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount | 85,000 |  |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 3 [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount |  | 150,000 | 62,500 |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 3 [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount | 85,000 |  |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 4 [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount |  | 275,000 | 200,000 |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 4 [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount | 150,000 |  |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 5 [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount | 90,000 |  |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 6 [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount | 90,000 |  |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2017-2 Notes [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Catastrophe reinsurance bonds funded amount |  |  |  |  | 300,000 |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2017-1 Notes [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Catastrophe reinsurance bonds funded amount |  |  |  |  | $ 950,000 |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2018-1 Notes [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Catastrophe reinsurance bonds funded amount |  |  | 262,500 |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2018-2 Notes [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Catastrophe reinsurance bonds funded amount |  |  | $ 262,500 |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2019-1 Notes [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Catastrophe reinsurance bonds funded amount |  | 425,000 |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2019-2 Notes [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Catastrophe reinsurance bonds funded amount |  | $ 425,000 |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Series 2021-1 Notes [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount | 320,000 |  |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Series 2021-2 Notes [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Reinsurance coverage amount | $ 330,000 |  |  |  |  |  |  |  |
Mt Logan Re [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Percentage of voting common shares owned by Group |  |  |  |  |  |  | 100.00% |  |
Assumed net risk exposures |  |  |  |  |  |  | $ 920,339 |  | 806,564
Net risk exposure investments |  |  |  |  |  |  | $ 70,419 |  | $ 67,645
Retrocede amount |  |  |  | $ 269,198 |  |  |  |  |
Cash transferred |  |  |  | 252,000 |  |  |  |  |
Mt Logan Re [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Accident year |  |  |  |  |  |  | 2002 |  |
Mt Logan Re [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |
Accident year |  |  |  |  |  |  | 2015 |  |
Liability retroceded |  |  |  | $ 319,000 |  |  |  |  |

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