Schedule III. Supplementary Insurance Information (Details) - Property and casualty business - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred Policy Acquisition Costs	$ 104,225	$ 91,446	$ 87,094
Future Policy Benefits, Losses, Claims and Loss Expenses	1,497,274	1,514,265	1,578,131
Unearned Premiums	474,388	439,733	464,845
Earned Premium Revenue	951,541	962,823	1,055,082
Investment Income, Net	44,932	55,778	39,670
Benefits, Claims, Losses and Settlement Expenses	637,301	652,155	869,467
Amortization of Deferred Policy Acquisition Costs	213,075	203,432	210,252
Other Underwriting Expenses	114,645	110,574	143,332
Premiums Written	$ 984,223	$ 941,348	$ 1,011,350