Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
The Prudential Insurance Company [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 144,411	$ 144,734
Unaffiliated Life Insurance Company [Member]
Loss Contingencies [Line Items]
Estimated cost to replace annuities	$ 30,123	$ 30,664