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Derivative Instruments and Hedging Activities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets    
Total assets $ 21   
Liabilities    
Total liabilities 106 353
Designated as Hedging Instrument [Member] | Prepaid expenses and other [Member]
   
Assets    
Derivative assets 11   
Designated as Hedging Instrument [Member] | Accrued liabilities [Member]
   
Liabilities    
Derivative Liabilities 71 197
Not Designated as Hedging Instrument [Member] | Prepaid expenses and other [Member]
   
Assets    
Derivative assets 10   
Not Designated as Hedging Instrument [Member] | Accrued liabilities [Member]
   
Liabilities    
Derivative Liabilities $ 35 $ 156