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Supplemental Cash Flow Information (Tables)
 9 Months Ended
Sep. 30, 2016
Supplemental Cash Flow Elements [Abstract]  
Net Changes In Components Of Operating Assets And Liabilities
The following table provides information regarding the net changes in components of operating assets and liabilities.
 
 
Nine Months Ended
September 30,
 
2016
 
2015
(Increase) decrease in:
 
 
 
Accounts receivable
$
11,029

 
$
72,372

Inventories
(26,215
)
 
(1,481
)
Deferred charges
(5,291
)
 
(7,256
)
Other current assets
5,184

 
(7,014
)
Increase (decrease) in:
 
 
 
Accounts payable
(27,213
)
 
(70,980
)
Accrued liabilities
(20,901
)
 
21,740

Net changes in components of operating assets and liabilities
(63,407
)
 
7,381