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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)
 6 Months Ended 12 Months Ended
Jun. 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 22.80% 21.40%
South Atlantic [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 22.20% 21.80%
Pacific [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 22.00% 23.80%
Other [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 33.00% [1] 33.00% [1]
Office Complex - Missouri
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 41.00% 40.50%
Retail [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 22.70% 23.20%
Multifamily [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 12.20% 12.90%
Hotel [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 10.80% 10.50%
Other [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 13.30% [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.