Minimum Guarantees - Separate Account Liabilities for GMDB (Details) (Guaranteed Minimum Death Benefit, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Guaranteed Minimum Death Benefit
Net Amount at Risk by Product and Guarantee [Line Items]
Separate account liability	$ 60,388	$ 61,140
Net amount at risk, net of reinsurance	$ 30,095	$ 32,032
Weighted average attained age	69 years	69 years