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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
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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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