Nature of Operations and Basis of Presentation (Deferred Policy Acquisition Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	$ 139,719
Underwriting costs deferred	48,805
Amortization of deferred policy acquisition costs	(42,472)
Ending unamortized deferred policy acquisition costs	146,052
Change in shadow deferred policy acquisition costs	(6,911)	(8,920)
Recorded asset at end of period	139,141
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	47,326
Amortization of deferred policy acquisition costs	(40,809)
Ending unamortized deferred policy acquisition costs	79,378
Change in shadow deferred policy acquisition costs	0
Recorded asset at end of period	79,378
Life Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	66,858
Underwriting costs deferred	1,479
Amortization of deferred policy acquisition costs	(1,663)
Ending unamortized deferred policy acquisition costs	66,674
Change in shadow deferred policy acquisition costs	(6,911)
Recorded asset at end of period	$ 59,763