Derivative Instruments - Narrative (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Gross amounts not offset in the balance sheet - cash collateral	[1]	$ 49,230	$ 30,958
Derivative, Collateral, Right to Reclaim Cash	[1]	6,570	$ 0
Life Funds Withheld Assets
Derivative [Line Items]
Embedded Derivative, Accumulated Net Gain (Loss) on Embedded Derivative		$ 900,100

[1] Derivative instruments in an asset or liability position are included within Other assets or Other liabilities, respectively, in the balance sheets on a net basis where the Company has both a legal right of offset and the intention to settle the contracts on a net basis. The Company often enters into different types of derivative contracts with a single counterparty and these contracts are covered under netting agreements.