Contingencies (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
The Prudential Insurance Company [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 142,661	$ 142,653
Unaffiliated Life Insurance Company [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 32,414	$ 31,964