Derivative Instruments - Fair Values of Derivative Instruments (Parenthetical) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Gross amounts of recognized derivative instruments	$ 0

- Definition

Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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