Nature of Operations and Basis of Presentation (Deferred Policy Acquisition Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 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	$ (1,277)
Recorded asset at end of period	89,836
Property and Casualty Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	88,102
Underwriting costs deferred	51,373
Amortization of deferred policy acquisition costs	(49,639)
Ending unamortized deferred policy acquisition costs	89,836
Impact of unrealized gains and losses on available-for-sale securities	0
Sale of discontinued operations	0
Recorded asset at end of period	89,836
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	52,749
Amortization of deferred policy acquisition costs	(51,534)
Ending unamortized deferred policy acquisition costs	160,468
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	$ 89,836