Nature of Operations and Basis of Presentation (Deferred Policy Acquisition Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of year	$ 105,300
Underwriting costs deferred	40,998
Amortization of deferred policy acquisition costs	(38,081)
Ending unamortized deferred policy acquisition costs	108,217
Change in shadow deferred policy acquisition costs	4,871	104
Recorded asset at end of period	113,088
Property and Casualty Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of year	64,947
Underwriting costs deferred	39,835
Amortization of deferred policy acquisition costs	(36,355)
Ending unamortized deferred policy acquisition costs	68,427
Change in shadow deferred policy acquisition costs	0
Recorded asset at end of period	68,427
Life Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of year	40,353
Underwriting costs deferred	1,163
Amortization of deferred policy acquisition costs	(1,726)
Ending unamortized deferred policy acquisition costs	39,790
Change in shadow deferred policy acquisition costs	4,871
Recorded asset at end of period	$ 44,661