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Collateralized Reinsurance And Trust Agreements (Summary of Collateralized Reinsurance Agreements) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Effects of Reinsurance [Line Items] |  |  |  |
Limit | $ 56,183 | $ 48,522 | $ 155,293 | $ 158,710
Kilimanjaro Re Limited [Member] | Series 2017-1 Class A-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 13, 2017 |
Expiration Date |  |  | Apr. 13, 2022 |
Limit |  |  | $ 50,000 |
Kilimanjaro Re Limited [Member] | Series 2017-1 Class B-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 13, 2017 |
Expiration Date |  |  | Apr. 13, 2022 |
Limit |  |  | $ 75,000 |
Kilimanjaro Re Limited [Member] | Series 2017-1 Class C-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 13, 2017 |
Expiration Date |  |  | Apr. 13, 2022 |
Limit |  |  | $ 175,000 |
Kilimanjaro Re Limited [Member] | Series 2018-1 Class A-1 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 30, 2018 |
Expiration Date |  |  | May 06, 2022 |
Limit |  |  | $ 62,500 |
Kilimanjaro Re Limited [Member] | Series 2018-1 Class B-1 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 30, 2018 |
Expiration Date |  |  | May 06, 2022 |
Limit |  |  | $ 200,000 |
Kilimanjaro Re Limited [Member] | Series 2018-1 Class A-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 30, 2018 |
Expiration Date |  |  | May 05, 2023 |
Limit |  |  | $ 62,500 |
Kilimanjaro Re Limited [Member] | Series 2018-1 Class B-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 30, 2018 |
Expiration Date |  |  | May 05, 2023 |
Limit |  |  | $ 200,000 |
Kilimanjaro Re Limited [Member] | Series 2019-1 Class A-1 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Dec. 12, 2019 |
Expiration Date |  |  | Dec. 19, 2023 |
Limit |  |  | $ 150,000 |
Kilimanjaro Re Limited [Member] | Series 2019-1 Class B-1 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Dec. 12, 2019 |
Expiration Date |  |  | Dec. 19, 2023 |
Limit |  |  | $ 275,000 |
Kilimanjaro Re Limited [Member] | Series 2019-1 Class A-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Dec. 12, 2019 |
Expiration Date |  |  | Dec. 19, 2024 |
Limit |  |  | $ 150,000 |
Kilimanjaro Re Limited [Member] | Series 2019-1 Class B-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Dec. 12, 2019 |
Expiration Date |  |  | Dec. 19, 2024 |
Limit |  |  | $ 275,000 |
Kilimanjaro Re Limited [Member] | Series 2020-1 Class A-1 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 08, 2021 |
Expiration Date |  |  | Apr. 21, 2025 |
Limit |  |  | $ 150,000 |
Kilimanjaro Re Limited [Member] | Series 2020-1 Class B-1 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 08, 2021 |
Expiration Date |  |  | Apr. 21, 2025 |
Limit |  |  | $ 85,000 |
Kilimanjaro Re Limited [Member] | Series 2020-1 Class C-1 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 08, 2021 |
Expiration Date |  |  | Apr. 21, 2025 |
Limit |  |  | $ 85,000 |
Kilimanjaro Re Limited [Member] | Series 2020-1 Class A-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 08, 2021 |
Expiration Date |  |  | Apr. 20, 2026 |
Limit |  |  | $ 150,000 |
Kilimanjaro Re Limited [Member] | Series 2020-1 Class B-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 08, 2021 |
Expiration Date |  |  | Apr. 20, 2026 |
Limit |  |  | $ 90,000 |
Kilimanjaro Re Limited [Member] | Series 2020-1 Class C-2 [Member] |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Effective Date |  |  | Apr. 08, 2021 |
Expiration Date |  |  | Apr. 20, 2026 |
Limit |  |  | $ 90,000 |

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