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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, 2016	Dec. 31, 2015
B Plus to -NR Credit Rating [Member]
Schedule of Available-for-sale Securities [Line Items]
Coupon	5.90%
Yield	6.00%
Weighted Average Life	2 years 6 months
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

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- Definition

Available-for-sale Debt Securities, Weighted Average Discount Rate

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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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