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Derivative Instruments Derivative Instruments (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Derivative Instruments [Abstract]    
Foreign Currency Contract, Asset, Fair Value Disclosure $ 2,932us-gaap_ForeignCurrencyContractAssetFairValueDisclosure  
Accumulated Unrealized Gain (Loss) on Cash Flow Hedging Instruments 1,993us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 88us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 214us-gaap_DerivativeGainLossOnDerivativeNet $ 13us-gaap_DerivativeGainLossOnDerivativeNet