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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2011
Long-Term Debt [Abstract]  
Long term debt
                 
    December  31,
2011
$		     December  31,
2010
$		  
     

U.S. Dollar-denominated Revolving Credit Facilities due through 2018

     49,274       188,000  

U.S. Dollar-denominated Term Loan due through 2018

     120,796       —    

U.S. Dollar-denominated Term Loan due through 2019

     346,768       371,685  

U.S. Dollar-denominated Term Loan due through 2021

     321,337       332,248  

U.S. Dollar-denominated Term Loan due through 2021

     114,868       120,599  

U.S. Dollar-denominated Unsecured Demand Loan

     13,282       13,282  

Euro-denominated Term Loans due through 2023

     348,906       373,301  
   

 

 

    

 

 

  

Total

     1,315,231       1,399,115  

Less current portion

     84,722       76,408  
   

 

 

    

 

 

  

Total

     1,230,509       1,322,707