Related Party Transactions (Affiliated Asset Transfers) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Prudential Insurance March 15 Purchase
Related Party Transaction [Line Items]
Fair Value		$ 91,972
Book Value		73,849
APIC, Net of Tax Increase/(Decrease)		(11,780)
Realized Investment Gain/(Loss), Net		0
Derivative Gain/(Loss)		0
Prudential Insurance June 15 Purchase
Related Party Transaction [Line Items]
Fair Value		11,096
Book Value		10,480
APIC, Net of Tax Increase/(Decrease)		(401)
Realized Investment Gain/(Loss), Net		0
Derivative Gain/(Loss)		$ 0
Prudential Insurance March 16 Sale
Related Party Transaction [Line Items]
Fair Value	$ 88,783
Book Value	88,875
APIC, Net of Tax Increase/(Decrease)	(60)
Realized Investment Gain/(Loss), Net	0
Derivative Gain/(Loss)	$ 0