Fair Value Measurements (Details 1) - Embedded derivatives [Member]	6 Months Ended
	Jun. 30, 2015
Unobservable inputs used by management in determining fair value of embedded derivatives
Risk margin for uncertainty in cash flows	0.52%
Minimum [Member]
Unobservable inputs used by management in determining fair value of embedded derivatives
Adjustment for insurance subsidiary's credit risk	0.30%
Surrenders	4.00%
Partial surrenders	2.00%
Annuitizations	1.00%
Deaths	1.50%
Budgeted option costs	2.00%
Maximum [Member]
Unobservable inputs used by management in determining fair value of embedded derivatives
Adjustment for insurance subsidiary's credit risk	2.10%
Surrenders	16.00%
Partial surrenders	10.00%
Annuitizations	1.50%
Deaths	3.00%
Budgeted option costs	3.25%