Schedule III. Supplementary Insurance Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred Policy Acquisition Costs	$ 92,796	$ 159,253	$ 164,112
Future Policy Benefits, Losses, Claims and Loss Expenses	1,312,483	2,544,584	2,474,399
Unearned Premiums	492,918	465,458	443,873
Earned Premium Revenue	1,050,454	1,058,860	1,023,401
Investment Income, Net	65,557	100,910	106,822
Benefits, Claims, Losses and Settlement Expenses	747,457	793,796	743,767
Amortization of Deferred Policy Acquisition Costs	208,127	212,927	211,013
Other Underwriting Expenses	145,337	116,909	103,421
Interest on Policyholders' Accounts	4,499	18,525	20,079
Premiums Written	1,061,664	1,019,113	964,970
Continuing Operations - Property and Casualty Insurance
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred Policy Acquisition Costs	92,796	88,102	93,362
Future Policy Benefits, Losses, Claims and Loss Expenses	1,312,483	1,224,183	1,123,896
Unearned Premiums	492,918	465,391	443,802
Earned Premium Revenue	1,037,451	997,492	936,131
Investment Income, Net	52,894	51,190	55,284
Benefits, Claims, Losses and Settlement Expenses	731,611	725,713	652,433
Amortization of Deferred Policy Acquisition Costs	206,232	207,746	202,892
Other Underwriting Expenses	141,473	103,628	83,540
Interest on Policyholders' Accounts	0	0	0
Premiums Written	1,061,664	1,019,113	964,970
Discontinued Operations | Discontinued Operations - Life Insurance
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]
Deferred Policy Acquisition Costs	0	71,151	70,750
Future Policy Benefits, Losses, Claims and Loss Expenses	0	1,320,401	1,350,503
Unearned Premiums	0	67	71
Earned Premium Revenue	13,003	61,368	87,270
Investment Income, Net	12,663	49,720	51,538
Benefits, Claims, Losses and Settlement Expenses	15,846	68,083	91,334
Amortization of Deferred Policy Acquisition Costs	1,895	5,181	8,121
Other Underwriting Expenses	3,864	13,281	19,881
Interest on Policyholders' Accounts	4,499	18,525	20,079
Premiums Written	$ 0	$ 0	$ 0