Nature of Operations and Basis of Presentation (Deferred Policy Acquisition Costs) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of year	$ 105,300
Underwriting costs deferred	78,077
Amortization of deferred policy acquisition costs	(74,789)
Ending unamortized deferred policy acquisition costs	108,588
Change in shadow deferred policy acquisition costs	29,223	(4,116)
Recorded asset at end of period	137,811
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	75,432
Amortization of deferred policy acquisition costs	(71,349)
Ending unamortized deferred policy acquisition costs	69,030
Change in shadow deferred policy acquisition costs	0
Recorded asset at end of period	69,030
Life Insurance [Member]
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Recorded asset at beginning of year	40,353
Underwriting costs deferred	2,645
Amortization of deferred policy acquisition costs	(3,440)
Ending unamortized deferred policy acquisition costs	39,558
Change in shadow deferred policy acquisition costs	29,223
Recorded asset at end of period	$ 68,781