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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 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.
 
 
Six Months Ended
June 30,
 
2019
 
2018
(Increase) decrease in:
 
 
 
Accounts receivable
$
34,843

 
$
15,834

Inventories
(11,298
)
 
(1,436
)
Deferred charges
463

 
(3,968
)
Other current assets
(14,804
)
 
(2,024
)
Decrease in:
 
 
 
Accounts payable
(5,705
)
 
(26,596
)
Accrued liabilities
(41,406
)
 
(15,965
)
Net changes in components of operating assets and liabilities
$
(37,907
)
 
$
(34,155
)