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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 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.
 
 
Six Months Ended
June 30,
 
2015
 
2014
(Increase) decrease in:
 
 
 
Accounts receivable
$
202

 
$
20,827

Inventories
(7,737
)
 
(44,523
)
Deferred charges
(7,725
)
 
—

Other current assets
2,286

 
47,542

Increase (decrease) in:
 
 
 
Accounts payable
(5,998
)
 
13,436

Accrued liabilities
(16,067
)
 
(43,971
)
Net changes in components of operating assets and liabilities
(35,039
)
 
(6,689
)