Related Party Transactions (Affiliated Asset Transfers) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Prudential Insurance March 15 Purchase
Related Party Transaction [Line Items]
Fair Value		$ 91,972
Book Value		73,849
Additional Paid-in Capital, Net of Tax Increase/ (Decrease)		(11,780)
Realized Investment Gain/ (Loss), Net of Tax		0
Prudential Insurance June 15 Purchase
Related Party Transaction [Line Items]
Fair Value		11,096
Book Value		10,480
Additional Paid-in Capital, Net of Tax Increase/ (Decrease)		(401)
Realized Investment Gain/ (Loss), Net of Tax		$ 0
Prudential Insurance March 16 Sale
Related Party Transaction [Line Items]
Fair Value	$ 88,783
Book Value	88,875
Additional Paid-in Capital, Net of Tax Increase/ (Decrease)	(60)
Realized Investment Gain/ (Loss), Net of Tax	$ 0