Supplemental Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2012

Supplemental Cash Flow Elements [Abstract]

Net Changes In Components Of Operating Assets And Liabilities

	Nine Months Ended September 30,
	2012			2011
(Increase) decrease in:
Accounts receivable	$	(80,789	)	$	(52,355	)
Inventories	33,826			(34,757		)
Other current assets	1,846			1,515
Increase (decrease) in:
Accounts payable	57,851			16,953
Accrued liabilities	6,144			17,906
Net changes in components of operating assets and liabilities	$	18,878		$	(50,738	)