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Debt Securities - Percentage Vintage, Property Type, and Location of Collateral Securing Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 100.00% 100.00%
Middle Atlantic [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 22.90% 21.40%
Pacific [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 21.70% 23.80%
South Atlantic [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 21.10% 21.80%
Other [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 34.30% [1] 33.00% [1]
Office Complex - Missouri
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 40.00% 40.50%
Retail [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 22.10% 23.20%
Hotel [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 13.00% 10.50%
Multifamily [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 12.30% 12.90%
Other [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 12.60% [1] 12.90% [1]
2006 [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 0.00% 1.00%
2007 [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 100.00% 99.00%
[1] No other individual category comprises more than 10% of the total.