Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2012

Supplemental Cash Flow Elements [Abstract]

Net Changes In Components Of Operating Assets And Liabilities

	Year Ended December 31,
	2012			2011			2010
(Increase) decrease in:
Accounts receivable	$	(34,299	)	$	(66,208	)	$	(41,648	)
Inventories	14,074			(46,151		)	(16,870		)
Other current assets	(9,593		)	(3,598		)	(4,036		)
Increase (decrease) in:
Accounts payable	53,146			33,049			47,401
Accrued liabilities	(10,263		)	15,977			9,666
Net changes in components of operating assets and liabilities	$	13,065		$	(66,931	)	$	(5,487	)