Supplemental Cash Flow Information

9 Months Ended

Sep. 30, 2013

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.

	Nine Months Ended September 30,
	2013			2012
(Increase) decrease in:
Accounts receivable	$	(92,906	)	$	(80,789	)
Inventories	(32,073		)	33,826
Other current assets	13,897			1,846
Increase (decrease) in:
Accounts payable	75,506			57,851
Accrued liabilities	7,222			6,144
Net changes in components of operating assets and liabilities	$	(28,354	)	$	18,878

Payments of interest and commitment fees were $32.5 million and $24.4 million for the nine months ended September 30, 2013 and September 30, 2012, respectively.

At September 30, 2013 and September 30, 2012, we had incurred liabilities for fixed and intangible asset additions totaling $22.9 million and $4.8 million, respectively, that had not been paid at the end of the third 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.