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Supplemental Cash Flow Information (Tables)
12 Months Ended
Dec. 31, 2012
Changes in Operating Assets and Liabilities
a) The changes in operating assets and liabilities for the years ended December 31, 2012, 2011, and 2010, are as follows:

 

     Year Ended December 31,  
     2012     2011     2010  

Accounts receivable

     (132,873     (68,914     (21,820

Prepaid expenses and other assets

     19,741       (8,225     12,719  

Accounts payable

     18,408       12,216       (11,002

Accrued and other liabilities

     (20,485     (19,424     65,518  
  

 

 

   

 

 

   

 

 

 
     (115,209     (84,347     45,415