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Summary of Investments (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Activity in the allowance for commercial mortgage loans credit losses      
Beginning balance $ 21,130 $ 16,300 $ 14,854
Provision increases 1,067 4,830 1,446
Charge-off (992)    
Recovery (75)    
Provision decreases (18,240)    
Ending balance 2,890 21,130 16,300
Allowance ending balance by basis of impairment method:      
Collectively evaluated for impairment 2,890 21,130 16,300
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 2,884,648 2,534,217 1,738,722
Individually evaluated for impairment 14,970 18,493 27,250
Collectively evaluated for impairment $ 2,869,678 $ 2,515,724 $ 1,711,472