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Summary of Investments (Details 4) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Activity in the allowance for commercial mortgage loans credit losses      
Beginning balance $ 2,890 $ 21,130 $ 2,890
Provision increases 248 1,067  
Charge-off (248) (992)  
Recovery   (75)  
Provision decreases   (18,240)  
Ending balance 2,890 2,890 2,890
Allowance ending balance by basis of impairment method:      
Collectively evaluated for impairment 2,890 2,890  
Recorded investment balance in the mortgage loan portfolio, gross of allowance, by basis of impairment method:      
Recorded investment balance in the mortgage loan portfolio, gross of allowance 2,900,614 2,884,648  
Individually evaluated for impairment 19,053 14,970  
Collectively evaluated for impairment 2,881,561 2,869,678  
Commercial mortgages, recorded investment of the mortgage loan portfolio by aging category      
Current 2,895,778 2,883,285  
Loan balances 31-60 days past due 4,384 663  
Loan balances greater than 90 days past due or in process of foreclosure 452 700  
Total portfolio balance $ 2,900,614 $ 2,884,648