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Nature of Operations and Basis of Presentation (Deferred Policy Acquisition Costs) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Recorded asset at beginning of period $ 150,092  
Underwriting costs deferred 134,593  
Amortization of deferred policy acquisition costs (124,374)  
Ending unamortized deferred policy acquisition costs 160,311  
Change in shadow deferred policy acquisition costs (13,764) 34,098
Recorded asset at end of period 146,547  
Property and Casualty Insurance [Member]
    
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Recorded asset at beginning of period 67,663  
Underwriting costs deferred 129,266  
Amortization of deferred policy acquisition costs (119,280)  
Ending unamortized deferred policy acquisition costs 77,649  
Change in shadow deferred policy acquisition costs 0  
Recorded asset at end of period 77,649  
Life Insurance [Member]
    
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]    
Recorded asset at beginning of period 82,429  
Underwriting costs deferred 5,327  
Amortization of deferred policy acquisition costs (5,094)  
Ending unamortized deferred policy acquisition costs 82,662  
Change in shadow deferred policy acquisition costs (13,764)  
Recorded asset at end of period $ 68,898