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Derivatives (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Derivative [Line Items]    
Number of Interest Rate Derivatives Held 0 2
Maturity of Foreign Currency Derivatives 2 years  
Derivative, Net Hedge Ineffectiveness Gain (Loss) $ 0 $ 0
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
   
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 236 288
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contracts [Member]
   
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 0 422
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contracts [Member]
   
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 236 (134)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contracts [Member]
   
Derivative [Line Items]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 1,057 (1,058)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
   
Derivative [Line Items]    
Derivative, Amount of Hedged Item   $ 100,000
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
   
Derivative [Line Items]    
Derivative, Fixed Interest Rate   2.947%