Fair Value Measurements FV Inputs of Assets (Details) - Recurring basis - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Embedded derivatives - GLWB	$ 5,712	$ 11,257
Significant unobservable inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Embedded derivatives - GLWB	$ 5,712	$ 11,257
Minimum | Internal model pricing valuation | Significant unobservable inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Volatility	15.00%	15.00%
Swap Curve	0.75%	0.75%
Lapse Rate	1.00%	1.00%
Maximum | Internal model pricing valuation | Significant unobservable inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity Volatility	28.00%	28.00%
Swap Curve	3.00%	3.00%
Lapse Rate	15.00%	15.00%