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Supplemental Cash Flow Information (Tables)
 3 Months Ended
Mar. 31, 2015
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,
 
2015
 
2014
(Increase) decrease in:
 
 
 
Accounts receivable
$
70,903

 
$
60,046

Inventories
(16,973
)
 
(11,700
)
Deferred charges
(3,103
)
 
—

Other current assets
(4,722
)
 
41,623

Increase (decrease) in:
 
 
 
Accounts payable
(37,826
)
 
(1,867
)
Accrued liabilities
(2,343
)
 
(35,184
)
Net changes in components of operating assets and liabilities
5,936

 
52,918