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Supplemental Cash Flow Information (Tables)
 9 Months Ended
Sep. 30, 2013
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.
 
 
Nine Months Ended
September 30,
 
2013
 
2012
(Increase) decrease in:
 
 
 
Accounts receivable
$
(92,906
)
 
$
(80,789
)
Inventories
(32,073
)
 
33,826

Other current assets
13,897

 
1,846

Increase (decrease) in:
 
 
 
Accounts payable
75,506

 
57,851

Accrued liabilities
7,222

 
6,144

Net changes in components of operating assets and liabilities
$
(28,354
)
 
$
18,878