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Supplemental Cash Flow Information (Tables)
 9 Months Ended
Sep. 30, 2019
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,
 
2019
 
2018
(Increase) decrease in:
 
 
 
Accounts receivable
$
6,294

 
$
87,318

Inventories
709

 
9,159

Deferred charges
135

 
(4,899
)
Other current assets
(10,358
)
 
(1,798
)
Decrease in:
 
 
 
Accounts payable
46,530

 
(68,974
)
Accrued liabilities
(48,954
)
 
6,524

Net changes in components of operating assets and liabilities
$
(5,644
)
 
$
27,330