Investments (Securities Pledged) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral pledged	$ 21,908	$ 10,218
Liabilities supported by pledged collateral	23,350	10,568
Fixed maturities, available-for-sale
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral pledged	21,908	10,218
Cash Collateral For Loaned Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Liabilities supported by pledged collateral	$ 23,350	$ 10,568