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Supplemental Cash Flow Information (Tables)
 3 Months Ended
Mar. 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.
 
 
Three Months Ended
March 31,
 
2017
 
2016
(Increase) decrease in:
 
 
 
Accounts receivable
$
9,169

 
$
10,810

Inventories
6,009

 
(19,815
)
Deferred charges
(348
)
 
(3,479
)
Other current assets
(4,605
)
 
(5,090
)
Decrease in:
 
 
 
Accounts payable
(17,305
)
 
(19,850
)
Accrued liabilities
(21,988
)
 
(14,643
)
Net changes in components of operating assets and liabilities
(29,068
)
 
(52,067
)