Reinsurance and Policy Provisions GMDB, IDB, GMIB (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 57,396	$ 65,640
Net Amount at Risk by Product and Guarantee, General Account Value	5,800	5,400
Net amount at risk by product and guarantee, benefits paid	$ 500	$ 400	$ 200
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age	57 years	62 years
GMDB return of net deposits [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Separate Account Value	$ 159,617	$ 175,286
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	543	623
Guaranteed Minimum Death Benefit [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Separate Account Value	270,539	279,981
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	2,920	14,858
Incremental Death Benefit [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Separate Account Value	241,142	256,929
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	53,933	50,159
Guaranteed Minimum Income Benefit [Member]
Net Amount at Risk by Product and Guarantee [Line Items]
Net Amount at Risk by Product and Guarantee, Separate Account Value	32,733	37,334
Net Amount at Risk by Product and Guarantee, Net Amount at Risk	$ 0	$ 0