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Supplemental Cash Flow Information (Tables)
 3 Months Ended
Mar. 31, 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.
 
 
Three Months Ended March 31,
 
2013
 
2012
(Increase) decrease in:
 
 
 
Accounts receivable
$
(85,915
)
 
$
(55,904
)
Inventories
7,947

 
(2,307
)
Other current assets
4,736

 
(2,327
)
Increase (decrease) in:
 
 
 
Accounts payable
57,048

 
52,055

Accrued liabilities
6,019

 
(8,785
)
Net changes in components of operating assets and liabilities
$
(10,165
)
 
$
(17,268
)