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Long-Term Debt (Details)
In Thousands, unless otherwise specified
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2011
U.S. Dollar-denominated Revolving Credit Facilities due through 2018 [Member]
USD ($)
Dec. 31, 2010
U.S. Dollar-denominated Revolving Credit Facilities due through 2018 [Member]
USD ($)
Dec. 31, 2011
U.S. Dollar-denominated Term Loan due through 2018 [Member]
USD ($)
Dec. 31, 2010
U.S. Dollar-denominated Term Loan due through 2018 [Member]
USD ($)
Dec. 31, 2011
U.S. Dollar-denominated Term Loan due through 2019 [Member]
USD ($)
Dec. 31, 2010
U.S. Dollar-denominated Term Loan due through 2019 [Member]
USD ($)
Dec. 31, 2011
U.S. Dollar-denominated Term Loan due through 2021 [Member]
USD ($)
Dec. 31, 2010
U.S. Dollar-denominated Term Loan due through 2021 [Member]
USD ($)
Dec. 31, 2011
U.S. Dollar-denominated Term Loan due through 2021 [Member]
USD ($)
Dec. 31, 2010
U.S. Dollar-denominated Term Loan due through 2021 [Member]
USD ($)
Dec. 31, 2011
U.S. Dollar-denominated Unsecured Demand Loan [Member]
USD ($)
Dec. 31, 2010
U.S. Dollar-denominated Unsecured Demand Loan [Member]
USD ($)
Dec. 31, 2011
Euro-denominated Term Loans due through 2023 [Member]
USD ($)
Dec. 31, 2011
Euro-denominated Term Loans due through 2023 [Member]
EUR (€)
Dec. 31, 2010
Euro-denominated Term Loans due through 2023 [Member]
USD ($)
Long term debt                                  
Total $ 1,315,231 $ 1,399,115 $ 49,274 $ 188,000 $ 120,796 $ 0 $ 346,768 $ 371,685 $ 321,337 $ 332,248 $ 114,868 $ 120,599 $ 13,282 $ 13,282 $ 348,906 € 269,200 $ 373,301
Less current portion 84,722 76,408                              
Total $ 1,230,509 $ 1,322,707