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Collateralized Reinsurance And Trust Agreements (Summary of Collateralized Reinsurance Agreements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effects of Reinsurance [Line Items]
Limit	$ 1,604,251	$ 1,365,378	$ 1,308,940
Kilimanjaro Re Limited [Member]
Effects of Reinsurance [Line Items]
Limit	$ 2,325,000
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 2021-1 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 2021-1 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 2021-1 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 2021-1 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 2021-1 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 2021-1 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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
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