Nature of Operations and Basis of Presentation (Deferred Policy Acquisition Costs) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	$ 139,719
Underwriting costs deferred	101,386
Amortization of deferred policy acquisition costs	(86,829)
Ending unamortized deferred policy acquisition costs	154,276
Impact of unrealized gains and losses on available-for-sale securities	4,797	$ (17,921)
Recorded asset at June 30, 2015	159,073
Property and Casualty Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	72,861
Underwriting costs deferred	98,396
Amortization of deferred policy acquisition costs	(83,458)
Ending unamortized deferred policy acquisition costs	87,799
Impact of unrealized gains and losses on available-for-sale securities	0
Recorded asset at June 30, 2015	87,799
Life Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	66,858
Underwriting costs deferred	2,990
Amortization of deferred policy acquisition costs	(3,371)
Ending unamortized deferred policy acquisition costs	66,477
Impact of unrealized gains and losses on available-for-sale securities	4,797
Recorded asset at June 30, 2015	$ 71,274