Supplemental Cash Flow Information

3 Months Ended

Mar. 31, 2012

Supplemental Cash Flow Information [Abstract]

Supplemental Cash Flow Information

12. Supplemental Cash Flow Information

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

	Three Months Ended March 31,
	2012			2011
(Increase) decrease in:
Accounts receivable	$	(55,904	)	$	(96,899	)
Inventories		(2,307	)		20,211
Other current assets		(2,327	)		(7,890	)
Increase (decrease) in:
Accounts payable		52,055			51,249
Accrued liabilities		(8,785	)		607
Net changes in components of operating assets and liabilities	$	(17,268	)	$	(32,722	)

Payments of interest and commitment fees were $5.2 million and $3.1 million for the three months ended March 31, 2012 and 2011, respectively. At March 31, 2012 and 2011, we had incurred liabilities for fixed and intangible asset additions totaling $4.1 million and $0.6 million, respectively, that had not been paid at the end of the first quarter, and, therefore, were not included in the caption "Payments to acquire fixed and intangible assets" under investing activities in the Unaudited Condensed Consolidated Statements of Cash Flows.