Nature of Operations and Basis of Presentation (Deferred Policy Acquisition Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	$ 168,264
Underwriting costs deferred	53,810
Amortization of deferred policy acquisition costs	(50,231)
Ending unamortized deferred policy acquisition costs	171,843
Impact of unrealized gains and losses on available-for-sale securities	(11,685)	$ (6,911)
Recorded asset at end of period	160,158
Property and Casualty Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	90,547
Underwriting costs deferred	52,540
Amortization of deferred policy acquisition costs	(48,412)
Ending unamortized deferred policy acquisition costs	94,675
Impact of unrealized gains and losses on available-for-sale securities	0
Recorded asset at end of period	94,675
Life Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	77,717
Underwriting costs deferred	1,270
Amortization of deferred policy acquisition costs	(1,819)
Ending unamortized deferred policy acquisition costs	77,168
Impact of unrealized gains and losses on available-for-sale securities	(11,685)
Recorded asset at end of period	$ 65,483