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Derivative Instruments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments [Abstract]    
Foreign Currency Contract, Asset, Fair Value Disclosure $ 2,334us-gaap_ForeignCurrencyContractAssetFairValueDisclosure $ 460us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
Unrealized Gain (Loss) on Cash Flow Hedging Instruments 1,561us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Derivative, Gain (Loss) on Derivative, Net $ 81us-gaap_DerivativeGainLossOnDerivativeNet $ 656us-gaap_DerivativeGainLossOnDerivativeNet