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Derivative Instruments - Designated as hedging, Financial Position (Details) (Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 4,740
Liability Derivatives		1,220
Interest Rate Swap [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	5,240	0
Interest Rate Swap [Member] \| Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	500	530
Interest Rate Swap [Member] \| Other long-term liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 0	$ 690

Fair value of financial asset or other 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 offset against an obligation to return collateral under a master netting arrangement.

+ References+ Details

- Definition

Fair value 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 offset against a right to receive collateral under a master netting arrangement.

+ References+ Details