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Debt Securities - Overall Statistics for Company's AAA-rated CMBS Investments Calculated on Weighted Average Basis (Details) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2013 | Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract] |  |
Coupon | 5.80% | 5.60%
Yield | 5.30% | 4.10%
Weighted Average Life | 2 years 2 months 12 days | 1 year 9 months 18 days

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- Definition Yield + References No definition available. + Details
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- Details
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