Nature of Operations and Basis of Presentation (Deferred Policy Acquisition Costs) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	$ 105,300
Underwriting costs deferred	118,196
Amortization of deferred policy acquisition costs	(113,556)
Ending unamortized deferred policy acquisition costs	109,940
Change in shadow deferred policy acquisition costs	34,098	(10,854)
Recorded asset at end of period	144,038
Property and Casualty Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	64,947
Underwriting costs deferred	113,812
Amortization of deferred policy acquisition costs	(108,591)
Ending unamortized deferred policy acquisition costs	70,168
Change in shadow deferred policy acquisition costs	0
Recorded asset at end of period	70,168
Life Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of period	40,353
Underwriting costs deferred	4,384
Amortization of deferred policy acquisition costs	(4,965)
Ending unamortized deferred policy acquisition costs	39,772
Change in shadow deferred policy acquisition costs	34,098
Recorded asset at end of period	$ 73,870