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Derivatives (Details 1) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Mar. 31, 2011
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Mar. 31, 2011
Interest Rate Swap [Member]
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Jun. 30, 2011
Designated as Hedging Instrument [Member]
Interest Rate Contracts [Member]
Cash Flow Hedging [Member]
Jun. 30, 2010
Designated as Hedging Instrument [Member]
Interest Rate Contracts [Member]
Cash Flow Hedging [Member]
Jun. 30, 2011
Designated as Hedging Instrument [Member]
Interest Rate Contracts [Member]
Cash Flow Hedging [Member]
Jun. 30, 2010
Designated as Hedging Instrument [Member]
Interest Rate Contracts [Member]
Cash Flow Hedging [Member]
Jun. 30, 2011
Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Member]
Cash Flow Hedging [Member]
Jun. 30, 2010
Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Member]
Cash Flow Hedging [Member]
Jun. 30, 2011
Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Member]
Cash Flow Hedging [Member]
Jun. 30, 2010
Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Member]
Cash Flow Hedging [Member]
Jun. 30, 2011
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Jun. 30, 2010
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Jun. 30, 2011
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Jun. 30, 2010
Designated as Hedging Instrument [Member]
Cash Flow Hedging [Member]
Jun. 30, 2011
Not Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Member]
Jun. 30, 2010
Not Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Member]
Jun. 30, 2011
Not Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Member]
Jun. 30, 2010
Not Designated as Hedging Instrument [Member]
Foreign Exchange Contracts [Member]
Derivative [Line Items]                                          
Number of Interest Rate Derivatives Held     2                                    
Derivative, Amount of Hedged Item         $ 100,000                                
Derivative, Fixed Interest Rate       2.947%                                  
Derivative, Net Hedge Ineffectiveness Gain (Loss) 0 0                                      
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net           0 390,000 422,000 522,000 (238,000) 39,000 (372,000) 26,000 (238,000) 429,000 50,000 548,000        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net                                   $ (147,000) $ 2,013,000 $ 911,000 $ 185,000