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Summary of Investments (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Mortgage loans on real estate        
Principal $ 2,866,411 $ 2,510,949    
Unamortized premium (discount) 18,237 23,268    
Mortgage provision allowance (2,890) (21,130) (16,300) (14,854)
Total mortgage loans 2,881,758 2,513,087    
Average recorded investment of impaired mortgage loans 1,034 5,822 5,101  
Mortgage loans on real estate
       
Recorded investment of the mortgage loan portfolio by risk assessment category        
Recorded investment 2,884,648 2,534,217    
Mortgage loans on real estate | Performing
       
Recorded investment of the mortgage loan portfolio by risk assessment category        
Recorded investment 2,884,648 2,532,150    
Mortgage loans on real estate | Non-performing
       
Recorded investment of the mortgage loan portfolio by risk assessment category        
Recorded investment   $ 2,067