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Derivative Instruments and Hedging Activities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Assets    
Derivative assets   $ 153
Liabilities    
Derivative Liabilities 641 108
Designated as Hedging Instrument [Member] | Prepaid expenses and other [Member]
   
Assets    
Derivative assets   66
Designated as Hedging Instrument [Member] | Accrued liabilities [Member]
   
Liabilities    
Derivative Liabilities 428 23
Not Designated as Hedging Instrument [Member] | Prepaid expenses and other [Member]
   
Assets    
Derivative assets   87
Not Designated as Hedging Instrument [Member] | Accrued liabilities [Member]
   
Liabilities    
Derivative Liabilities $ 213 $ 85