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Investments (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investments (Textual) [Abstract]      
Fair value of issued securities $ 6,009,573 $ 5,962,232  
Investments (Additional Textual) [Abstract]      
Net realized investment gains 22,245 27,298 37,663
Gross gains realized on security sales 29,511 39,941 39,709
Realized losses on securities 5,734 12,643 1,974
Fixed maturities and equity securities with investment grade rating, percent of gross unrealized loss 95.00%    
Fair value of securities on deposit 17,967 18,565  
Impairment of securities 1,532   72
Fair value of securities transferred 24,791 0  
Obligation for securities sold under agreement to repurchase, including accrued interest 25,864 0  
Cash received in an amount equal to fair value of securities transferred 95.00%    
Secured Debt 250,000    
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
     
Investments (Textual) [Abstract]      
Fair value of issued securities 336,193 375,111  
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
     
Investments (Textual) [Abstract]      
Fair value of issued securities 427,172 418,174  
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
     
Investments (Textual) [Abstract]      
Fair value of issued securities 126,245 136,998  
Federal Home Loan Bank [Member]
     
Investments (Additional Textual) [Abstract]      
Fair Value of Securities on deposit with Federal Home Loan Bank $ 274,437