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Collateralized Reinsurance And Trust Agreements (Narrative) (Details) $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 USD ($) Item | Apr. 01, 2018 USD ($) | Apr. 13, 2017 USD ($) Item | Dec. 01, 2015 USD ($) Item | Nov. 18, 2014 USD ($) | Apr. 24, 2014 USD ($) Item | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount on deposit in trust accounts |  |  |  |  |  |  | $ 867,357 |  | $ 867,357 |  |
Preferred shares |  |  |  |  |  |  |  |  |  |  |
Reinsurance coverage amount |  |  |  |  |  |  | 97,391 | $ 73,015 | $ 237,841 | $ 203,445 |
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 |  | 2 |  |  |  |  |
Reinsurance agreements expiration date |  |  |  |  |  | Apr. 01, 2018 |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance [Member] |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of collateralized reinsurance agreements | Item | 4 |  |  |  |  |  |  |  |  |  |
Reinsurance coverage amount |  |  |  |  | $ 500,000 |  |  |  |  |  |
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 And 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of collateralized reinsurance agreements | Item | 2 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Reinsurance contract term | 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 1 [Member] |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinsurance coverage amount | $ 62,500 |  | $ 225,000 | $ 300,000 |  | $ 250,000 |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 2 [Member] |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinsurance coverage amount | 200,000 |  | 400,000 | $ 325,000 |  | 200,000 |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 3 [Member] |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinsurance coverage amount | 62,500 |  |  |  |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Agreement 4 [Member] |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reinsurance coverage amount | 200,000 |  |  |  |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2014-1 Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Catastrophe reinsurance bonds funded amount |  |  |  |  |  | $ 450,000 |  |  |  |  |
Catastrophe Reinsurance Bonds Redeemed Amount | 450,000 |  |  |  |  |  |  |  |  |  |
Kilimanjaro Re Limited [Member] | Catastrophe Reinsurance Series 2014-2 Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Catastrophe reinsurance bonds funded amount |  |  |  |  | $ 500,000 |  |  |  |  |  |
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 2017-2 Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Catastrophe reinsurance bonds funded amount |  |  | $ 300,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Mt. Logan Re [Member] |  |  |  |  |  |  |  |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of voting common shares owned by Group |  |  |  |  |  |  |  |  | 100.00% |  |
Assumed net risk exposures |  |  |  |  |  |  |  |  | $ 993,036 |  | 1,156,853
Preferred shares |  |  |  |  |  |  | $ 45,748 |  | $ 45,748 |  | $ 45,625
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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