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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 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.
 
 
Six Months Ended
June 30,
 
2017
 
2016
(Increase) decrease in:
 
 
 
Accounts receivable
$
3,666

 
$
(21,274
)
Inventories
29,800

 
(34,512
)
Deferred charges
(93
)
 
(6,272
)
Other current assets
(2,115
)
 
(4,335
)
Decrease in:
 
 
 
Accounts payable
(6,843
)
 
(5,642
)
Accrued liabilities
(16,102
)
 
(18,206
)
Net changes in components of operating assets and liabilities
8,313

 
(90,241
)