Nature of Operations and Basis of Presentation (Deferred Policy Acquisition Costs) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	$ 88,102
Impact of unrealized gains and losses on available-for-sale securities	7,274	$ (3,582)
Recorded asset at end of period	95,140
Property & Casualty Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	88,102
Underwriting costs deferred	159,245
Amortization of deferred policy acquisition costs	(152,207)
Ending unamortized deferred policy acquisition costs	95,140
Impact of unrealized gains and losses on available-for-sale securities	0
Sale of discontinued operations	0
Recorded asset at end of period	95,140
Discontinued Operations | Life Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	71,151
Underwriting costs deferred	1,376
Amortization of deferred policy acquisition costs	(1,895)
Ending unamortized deferred policy acquisition costs	70,632
Impact of unrealized gains and losses on available-for-sale securities	7,274
Sale of discontinued operations	(77,906)
Recorded asset at end of period	0
Continuing and Discontinuing Operations
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	159,253
Underwriting costs deferred	160,621
Amortization of deferred policy acquisition costs	(154,102)
Ending unamortized deferred policy acquisition costs	165,772
Impact of unrealized gains and losses on available-for-sale securities	7,274
Sale of discontinued operations	(77,906)
Recorded asset at end of period	$ 95,140