Value of Business Acquired (Balance of and Changes in VOBA) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Present Value of Future Insurance Profits [Roll Forward]
Balance, beginning of year	$ 33,640	$ 39,738	$ 43,500
Amortization-Impact of assumption and experience unlocking and true-ups	2,372	3,412	5,412
Amortization-All other	(8,176)	(10,477)	(11,181)
Interest	1,939	2,436	2,615
Change in unrealized investment gains and losses	512	1,163	608
Ceded VOBA upon Reinsurance Treaty with Prudential Insurance	0	(2,632)	0
Balance, end of year	$ 30,287	$ 33,640	$ 39,738
Weighted Average Useful Life	5 years 1 month 17 days
Interest accrual rates	6.00%	6.05%	6.10%