Nature of Operations and Basis of Presentation (Deferred Policy Acquisition Costs) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	$ 168,264
Underwriting costs deferred	113,822
Amortization of deferred policy acquisition costs	(102,816)
Ending unamortized deferred policy acquisition costs	179,270
Impact of unrealized gains and losses on available-for-sale securities	(20,220)	$ 4,797
Recorded asset at end of period	159,050
Property & Casualty Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	90,547
Underwriting costs deferred	110,927
Amortization of deferred policy acquisition costs	(98,976)
Ending unamortized deferred policy acquisition costs	102,498
Impact of unrealized gains and losses on available-for-sale securities	0
Recorded asset at end of period	102,498
Life Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	77,717
Underwriting costs deferred	2,895
Amortization of deferred policy acquisition costs	(3,840)
Ending unamortized deferred policy acquisition costs	76,772
Impact of unrealized gains and losses on available-for-sale securities	(20,220)
Recorded asset at end of period	$ 56,552