XML 27 R40.htm IDEA: XBRL DOCUMENT v2.4.0.8
Debt Securities - Overall Statistics for Company's AAA-rated CMBS Investments Calculated on Weighted Average Basis (Details)
 9 Months Ended 12 Months Ended
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