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Supplemental Cash Flow Information (Tables)
 9 Months Ended
Sep. 30, 2017
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,
 
2017
 
2016
(Increase) decrease in:
 
 
 
Accounts receivable
$
(79,938
)
 
$
11,029

Inventories
31,973

 
(26,215
)
Deferred charges
(293
)
 
(5,291
)
Other current assets
(2,769
)
 
5,184

Increase (decrease) in:
 
 
 
Accounts payable
32,896

 
(27,213
)
Accrued liabilities
(8,131
)
 
(20,901
)
Net changes in components of operating assets and liabilities
(26,262
)
 
(63,407
)