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Summary of Investments (Details 3) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Mortgage loans on real estate        
Principal $ 2,883,687 $ 2,866,411    
Charge-off (248)      
Unamortized premium (discount) 17,175 18,237    
Mortgage provision allowance (2,890) (2,890) (2,890) (21,130)
Total mortgage loans 2,897,724 2,881,758 2,881,758  
Mortgage loans on real estate
       
Recorded investment of the mortgage loan portfolio by risk assessment category        
Recorded investment 2,900,614 2,884,648    
Mortgage loans on real estate | Performing
       
Recorded investment of the mortgage loan portfolio by risk assessment category        
Recorded investment 2,900,162 2,884,648    
Mortgage loans on real estate | Non-performing
       
Recorded investment of the mortgage loan portfolio by risk assessment category        
Recorded investment $ 452