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Supplemental Cash Flow Information (Tables)
12 Months Ended
Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]  
Changes in Operating Assets and Liabilities
  a)

The changes in operating assets and liabilities for the years ended December 31, 2015, 2014, and 2013, are as follows:

 

     Year Ended December 31,  
     2015      2014      2013  

Accounts receivable

     (6,488      136,660        (77,837

Prepaid expenses and other assets

     (10,607      (1,618      (2,386

Accounts payable

     (24,727      (17,643      (10,877

Accrued and other liabilities

     29,531        (56,768      155,284  
  

 

 

    

 

 

    

 

 

 
     (12,291      60,631        64,184