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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
(Increase) decrease in:
 
 
 
Accounts receivable
$
15,834

 
$
3,666

Inventories
(1,436
)
 
29,800

Deferred charges
(3,968
)
 
(93
)
Other current assets
(2,024
)
 
(2,115
)
Decrease in:
 
 
 
Accounts payable
(26,596
)
 
(6,843
)
Accrued liabilities
(15,965
)
 
(16,102
)
Net changes in components of operating assets and liabilities
$
(34,155
)
 
$
8,313