Schedule III. Supplementary Insurance Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred Policy Acquisition Costs	$ 94,292	$ 92,796	$ 159,253
Future Policy Benefits, Losses, Claims and Loss Expenses	1,421,754	1,312,483	2,544,584
Unearned Premiums	505,162	492,918	465,458
Earned Premium Revenue	1,086,972	1,050,454	1,058,860
Investment Income, Net	60,414	65,557	100,910
Benefits, Claims, Losses and Settlement Expenses	830,172	747,457	793,796
Amortization of Deferred Policy Acquisition Costs	216,699	208,127	212,927
Other Underwriting Expenses	137,415	145,337	116,909
Interest on Policyholders' Accounts	0	4,499	18,525
Premiums Written	1,096,730	1,061,664	1,019,113
Continuing Operations - Property and Casualty Insurance
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred Policy Acquisition Costs	94,292	92,796	88,102
Future Policy Benefits, Losses, Claims and Loss Expenses	1,421,754	1,312,483	1,224,183
Unearned Premiums	505,162	492,918	465,391
Earned Premium Revenue	1,086,972	1,037,451	997,492
Investment Income, Net	60,414	52,894	51,190
Benefits, Claims, Losses and Settlement Expenses	830,172	731,611	725,713
Amortization of Deferred Policy Acquisition Costs	216,699	206,232	207,746
Other Underwriting Expenses	137,415	141,473	103,628
Interest on Policyholders' Accounts	0	0	0
Premiums Written	1,096,730	1,061,664	1,019,113
Discontinued Operations | Discontinued Operations - Life Insurance
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred Policy Acquisition Costs	0	0	71,151
Future Policy Benefits, Losses, Claims and Loss Expenses	0	0	1,320,401
Unearned Premiums	0	0	67
Earned Premium Revenue	0	13,003	61,368
Investment Income, Net	0	12,663	49,720
Benefits, Claims, Losses and Settlement Expenses	0	15,846	68,083
Amortization of Deferred Policy Acquisition Costs	0	1,895	5,181
Other Underwriting Expenses	0	3,864	13,281
Interest on Policyholders' Accounts	0	4,499	18,525
Premiums Written	$ 0	$ 0	$ 0