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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 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.
 
 
Six Months Ended
June 30,
 
2013
 
2012
(Increase) decrease in:
 
 
 
Accounts receivable
$
(82,346
)
 
$
6,698

Inventories
(858
)
 
28,146

Other current assets
11,135

 
5,197

Increase (decrease) in:
 
 
 
Accounts payable
66,860

 
(9,549
)
Accrued liabilities
3,741

 
(10,568
)
Net changes in components of operating assets and liabilities
$
(1,468
)
 
$
19,924