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Supplemental Cash Flow Information (Tables)
 3 Months Ended
Mar. 31, 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.
 
 
Three Months Ended
March 31,
 
2019
 
2018
(Increase) decrease in:
 
 
 
Accounts receivable
$
18,170

 
$
27,368

Inventories
(6,616
)
 
(4,469
)
Deferred charges
(4,092
)
 
(4,161
)
Other current assets
(5,067
)
 
(7,694
)
(Decrease) increase in:
 
 
 
Accounts payable
5,226

 
94

Accrued liabilities
(4,421
)
 
(14,920
)
Net changes in components of operating assets and liabilities
$
3,200

 
$
(3,782
)