Supplemental Cash Flow Information

6 Months Ended

Jun. 30, 2012

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

11. Supplemental Cash Flow Information

The following table provides information regarding the net changes in components of operating assets and liabilities.

	Six Months Ended June 30,
	2012			2011
(Increase) decrease in:
Accounts receivable	$	6,698		$	(54,810	)
Inventories	28,146			(33,847		)
Other current assets	5,197			(1,727		)
Increase (decrease) in:
Accounts payable	(9,549		)	37,167
Accrued liabilities	(10,568		)	4,182
Net changes in components of operating assets and liabilities	$	19,924		$	(49,035	)

Payments of interest and commitment fees were $21.6 million and $17.6 million for the six months ended June 30, 2012 and 2011, respectively. At June 30, 2012 and 2011, we had incurred liabilities for fixed and intangible asset additions totaling $8.1 million and $0.9 million, respectively, that had not been paid at the end of the second quarter, and, therefore, were not included in the caption “Payments to acquire fixed and intangible assets” under Cash Flows from Investing Activities in the Unaudited Condensed Consolidated Statements of Cash Flows.