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Derivative Instruments - Designated as hedging, Financial Position (Details) (Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 2,050 $ 1,720
Interest Rate Swap [Member] | Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives 2,300 2,080
Interest Rate Swap [Member] | Accrued Liabilities [Member]
   
Derivatives, Fair Value [Line Items]    
Liability Derivatives (620) (360)
Foreign Exchange Contract [Member] | Other Assets [Member]
   
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 370 $ 0