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