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Debt Securities - Overall Statistics for Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Details) - Commercial Mortgage Backed Securities [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
BB to D Credit Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Coupon	5.90%
Yield	6.50%
Weighted Average Life	1 year 7 months 6 days
AAA to CCC- Rated CMBS [Member]
Schedule of Available-for-sale Securities [Line Items]
Coupon		5.90%
Yield		6.40%
Weighted Average Life		2 years 3 months 18 days

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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