Supplemental Cash Flow Information

6 Months Ended

Jun. 30, 2014

Supplemental Cash Flow Elements [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.

	Six Months Ended June 30,
	2014			2013
(Increase) decrease in:
Accounts receivable	$	20,827		$	(82,346	)
Inventories	(44,523		)	(858		)
Other current assets	47,542			11,135
Increase (decrease) in:
Accounts payable	13,436			66,860
Accrued liabilities	(43,971		)	3,741
Net changes in components of operating assets and liabilities	$	(6,689	)	$	(1,468	)

Payments of interest and commitment fees were $33.4 million and $18.9 million for the six months ended June 30, 2014 and June 30, 2013, respectively.

At June 30, 2014 and June 30, 2013, we had incurred liabilities for fixed and intangible asset additions totaling $42.1 million and $20.8 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.

At June 30, 2014 and June 30, 2013, we had incurred liabilities for other asset additions totaling $0.1 million and $0.2 million, respectively, that had not been paid at the end of the second quarter and, therefore, were not included in the caption "Other, net" under Cash Flows from Investing Activities in the Unaudited Condensed Consolidated Statements of Cash Flows.