Summary of Significant Accounting Policies (details) - Key Assumptions	12 Months Ended
	Dec. 31, 2014
Prime [Member] | Minimum [Member]
Key assumptions used in estimation of present value of structured fixed maturity securities
Voluntary prepayment rates	4.00%
Percentage of remaining pool liquidated due to defaults	1.00%
Loss severity	30.00%
Prime [Member] | Maxiumum [Member]
Key assumptions used in estimation of present value of structured fixed maturity securities
Voluntary prepayment rates	34.00%
Percentage of remaining pool liquidated due to defaults	40.00%
Loss severity	65.00%
Alt-A [Member] | Minimum [Member]
Key assumptions used in estimation of present value of structured fixed maturity securities
Voluntary prepayment rates	0.00%
Percentage of remaining pool liquidated due to defaults	9.00%
Loss severity	45.00%
Alt-A [Member] | Maxiumum [Member]
Key assumptions used in estimation of present value of structured fixed maturity securities
Voluntary prepayment rates	15.00%
Percentage of remaining pool liquidated due to defaults	69.00%
Loss severity	80.00%
Sub-Prime [Member] | Minimum [Member]
Key assumptions used in estimation of present value of structured fixed maturity securities
Voluntary prepayment rates	1.00%
Percentage of remaining pool liquidated due to defaults	22.00%
Loss severity	65.00%
Sub-Prime [Member] | Maxiumum [Member]
Key assumptions used in estimation of present value of structured fixed maturity securities
Voluntary prepayment rates	9.00%
Percentage of remaining pool liquidated due to defaults	71.00%
Loss severity	110.00%