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Supplemental Cash Flow Information (Tables)
 3 Months Ended
Mar. 31, 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.
 
 
Three Months Ended
March 31,
 
2018
 
2017
(Increase) decrease in:
 
 
 
Accounts receivable
$
27,368

 
$
9,169

Inventories
(4,469
)
 
6,009

Deferred charges
(4,161
)
 
(348
)
Other current assets
(7,694
)
 
(4,605
)
Increase (decrease) in:
 
 
 
Accounts payable
94

 
(17,305
)
Accrued liabilities
(14,920
)
 
(21,988
)
Net changes in components of operating assets and liabilities
(3,782
)
 
(29,068
)