Statutory Reporting, Capital Requirements and Dividends and Retained Earnings Restrictions - Statutory Capital and Surplus (Details) - Property and casualty business - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statutory Accounting Practices [Line Items]
Statutory Capital and Surplus	$ 635,474	$ 717,709	$ 754,411
Statutory Net Income (Loss)	$ (13,251)	$ 43,111	$ 110,827