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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
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:
 
 
Year Ended December 31,
 
2017
 
2016
 
2015
(Increase) decrease in:
 
 
 
 
 
Accounts receivable
$
(140,948
)
 
$
(9,859
)
 
$
99,384

Inventories
49,055

 
(54,361
)
 
3,811

Deferred charges
(3,622
)
 
(3,902
)
 
(11,916
)
Other current assets
(410
)
 
3,059

 
6,417

Increase (decrease) in:
 
 
 
 
 
Accounts payable
97,569

 
(17,426
)
 
(101,581
)
Accrued liabilities
8,512

 
(8,161
)
 
9,257

Net changes in components of operating assets and liabilities
$
10,156

 
$
(90,650
)
 
$
5,372