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Foreign Currency Derivative Instruments Foreign Currency Derivative Instruments (Schedule of Gross Amounts, Amounts Offset, and Net Amounts) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Gross amounts of recognized asset (liability) $ (1,993)us-gaap_DerivativeLiabilityFairValueGrossAsset  
Gross amounts of recognized asset (liability)   373us-gaap_DerivativeFairValueOfDerivativeAsset
Gross amounts offset in the consolidated balance sheets 350us-gaap_DerivativeAssetFairValueGrossLiability 9us-gaap_DerivativeAssetFairValueGrossLiability
Net amount of recognized asset (liability) presented in the consolidated balance sheets (1,643)us-gaap_DerivativeLiabilities  
Net amount of recognized asset (liability) presented in the consolidated balance sheets   $ 382us-gaap_DerivativeAssets