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Derivative Financial Instruments Derivative Financial Instruments Narrative (Details)
9 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
contracts
customers
Jun. 30, 2011
contracts
Sep. 30, 2011
Euro Term Loan Interest Rate Swap [Member]
USD ($)
Sep. 30, 2011
Euro Term Loan Interest Rate Swap [Member]
Jun. 30, 2011
Euro Term Loan Interest Rate Swap [Member]
Dec. 31, 2010
Euro Term Loan Interest Rate Swap [Member]
USD ($)
Dec. 31, 2010
Euro Term Loan Interest Rate Swap [Member]
EUR (€)
Sep. 30, 2011
USD Term Loan Interest Rate Swap June 2011 A [Member]
USD ($)
Jun. 30, 2011
USD Term Loan Interest Rate Swap June 2011 A [Member]
Sep. 30, 2011
USD Term Loan Interest Rate Swap June 2011 B [Member]
USD ($)
Jun. 30, 2011
USD Term Loan Interest Rate Swap June 2011 B [Member]
Sep. 30, 2011
Minimum [Member]
USD ($)
Sep. 30, 2011
Maximum [Member]
USD ($)
Dec. 31, 2010
EUR Denominated Term Loan [Member]
USD ($)
Dec. 31, 2010
EUR Denominated Term Loan [Member]
EUR (€)
Number of USD Term Loan Interest Rate Derivatives Expired 2             
Pay fixed interest rate in interst rate swap  6.59%6.59%    2.11% 2.15%    
Percentage rate above EURIBOR receive on interest rate swap    2.00%          
Derivative, Description of Variable Rate Basis   Interbank Offered Rate (EURIBOR), plus 2%.           
Notional amount of interest rate swaps     $ 147,700,000€ 112,400,000$ 100,000,000 $ 100,000,000     
Notional amount of Euro denominated term loan             174,000,000132,400,000
Number of foreign exchange forward contracts entered into YTD421              
Notional amount of foreign currency forward contracts           50,00072,000,000  
Cash Payment to Terminate Interest Rate Swap  $ 2,900,000