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Derivatives Balance Sheet Location (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Assets $ 1,062 $ 1,703
Liabilities 1,373 893
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Assets 375 1,621
Liabilities 915 377
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Assets 687 64
Liabilities 142 128
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Assets 0 18
Liabilities $ 316 $ 388