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Derivative Instruments and Hedging Activities - Open Foreign Currency Contracts (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Derivative, Fair Value, Net $ 1,964 $ (2,741)
Cash Flow Hedging | Foreign exchange contracts
   
Derivative [Line Items]    
Notional Amounts (in US Dollars) 123,976  
Derivative, Fair Value, Net 2,219  
Cash Flow Hedging | Foreign exchange contracts | Currency, Australian Dollar
   
Derivative [Line Items]    
Notional Amounts (in US Dollars) 7,531  
Derivative, Fair Value, Net 809  
Cash Flow Hedging | Foreign exchange contracts | Currency, Canadian Dollar
   
Derivative [Line Items]    
Notional Amounts (in US Dollars) 67,570  
Derivative, Fair Value, Net 1,845  
Cash Flow Hedging | Foreign exchange contracts | Currency, Japanese Yen
   
Derivative [Line Items]    
Notional Amounts (in US Dollars) 26,925  
Derivative, Fair Value, Net (1,002)  
Cash Flow Hedging | Foreign exchange contracts | Currency, Mexican Peso
   
Derivative [Line Items]    
Notional Amounts (in US Dollars) 8,999  
Derivative, Fair Value, Net 120  
Cash Flow Hedging | Foreign exchange contracts | Norwegian Kroner
   
Derivative [Line Items]    
Notional Amounts (in US Dollars) 4,848  
Derivative, Fair Value, Net 227  
Cash Flow Hedging | Foreign exchange contracts | Currency, Swedish Krone
   
Derivative [Line Items]    
Notional Amounts (in US Dollars) 8,103  
Derivative, Fair Value, Net $ 220