Nature of Operations and Basis of Presentation (Deferred Policy Acquisition Costs) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	$ 93,362
Impact of unrealized gains and losses on available-for-sale securities	(3,582)	$ (19,857)
Recorded asset at end of period	97,477
Property and Casualty Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	93,362
Underwriting costs deferred	158,960
Amortization of deferred policy acquisition costs	(154,845)
Ending unamortized deferred policy acquisition costs	97,477
Impact of unrealized gains and losses on available-for-sale securities	0
Recorded asset at end of period	97,477
Discontinued Operations | Life Insurance
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	70,750
Underwriting costs deferred	4,192
Amortization of deferred policy acquisition costs	(5,524)
Ending unamortized deferred policy acquisition costs	69,418
Impact of unrealized gains and losses on available-for-sale securities	(3,582)
Recorded asset at end of period	65,836
Continuing and Discontinuing Operations
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	164,112
Underwriting costs deferred	163,152
Amortization of deferred policy acquisition costs	(160,369)
Ending unamortized deferred policy acquisition costs	166,895
Impact of unrealized gains and losses on available-for-sale securities	(3,582)
Recorded asset at end of period	$ 163,313