Supplemental Cash Flow Information

6 Months Ended

Jun. 30, 2015

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

13. 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,
	2015			2014
(Increase) decrease in:
Accounts receivable	$	202		$	20,827
Inventories	(7,737		)	(44,523		)
Deferred charges	(7,725		)	—
Other current assets	2,286			47,542
Increase (decrease) in:
Accounts payable	(5,998		)	13,436
Accrued liabilities	(16,067		)	(43,971		)
Net changes in components of operating assets and liabilities	(35,039		)	(6,689		)

Payments of interest and commitment fees, net of amounts capitalized, were $40.3 million and $33.4 million for the six months ended June 30, 2015 and June 30, 2014, respectively. We capitalized interest of $7.2 million and $10.0 million during the six months ended June 30, 2015 and June 30, 2014.

At June 30, 2015 and June 30, 2014, we had incurred liabilities for fixed and intangible asset additions totaling $52.9 million and $42.1 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, 2015 we had incurred liabilities for other asset additions totaling $12.7 million, 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.