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Derivative Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Fair values of derivative instruments
Liabilities under derivative instruments	$ 1,690
Designated as Hedging Instruments \| Interest rate contracts
Fair values of derivative instruments
Liabilities under derivative instruments	$ 1,690

Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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