Schedule III. Supplementary Insurance Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred Policy Acquisition Costs	$ 91,446	$ 87,094	$ 94,292
Future Policy Benefits, Losses, Claims and Loss Expenses	1,514,265	1,578,131	1,421,754
Unearned Premiums	439,733	464,845	505,162
Earned Premium Revenue	962,823	1,055,082	1,086,972
Investment Income, Net	55,778	39,670	60,414
Benefits, Claims, Losses and Settlement Expenses	652,155	869,467	830,172
Amortization of Deferred Policy Acquisition Costs	203,432	210,252	216,199
Other Underwriting Expenses	110,574	143,332	137,415
Premiums Written	$ 941,348	$ 1,011,350	$ 1,096,730