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Property and Casualty Unpaid Claims and Claim Expenses (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Property and Casualty Unpaid Claims and Claim Expenses (Textual) [Abstract]        
Benefits, claims and settlement expenses $ 448,250 $ 502,434 $ 474,833  
Property and Casualty Unpaid Claims and Claim Expenses (Additional Textual) [Abstract]        
Favorable development of total reserves for property and casualty claims occurring in prior years 17,175 10,310 20,530  
Automobile liability coverage reserves as percentage of total reserves 70.00%      
Short tail coverage reserves as percentage of total reserves 20.00%      
Long tail coverage reserves as percentage of total reserves 80.00%      
Potential variability of property and casualty loss reserves 6.00%      
Potential variability of property and casualty loss reserves plus minus of net income 10,000      
Life and Annuity [Member]
        
Property and Casualty Unpaid Claims and Claim Expenses (Textual) [Abstract]        
Unpaid claims and claim expenses 14,853 13,729 14,073 11,763
Benefits, claims and settlement expenses $ 58,820 $ 59,917 $ 56,579