Supplemental Cash Flow Information

9 Months Ended

Sep. 30, 2021

Supplemental Cash Flow Elements [Abstract]

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


	Nine Months Ended September 30,
	2021		2020
(Increase) decrease in:
Accounts receivable	$	15,487	$	165,505
Inventories	11,108		(24,674)
Deferred charges	20,362		17,616
Other current assets	(10,335)		(1,620)
Increase (decrease) in:
Accounts payable	(50,361)		(59,477)
Accrued liabilities	20,196		(25,204)
Net changes in components of operating assets and liabilities	$	6,457	$	72,146

Payments of interest and commitment fees were $154.4 million and $138.3 million for the nine months ended September 30, 2021 and September 30, 2020, respectively. We capitalized interest of $2.3 million and $1.4 million during the nine months ended September 30, 2021 and September 30, 2020, respectively.

At September 30, 2021 and September 30, 2020, we had incurred liabilities for fixed and intangible asset additions totaling $44.9 million and $26.5 million, respectively, that had not been paid at the end of the 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. The increase in this amount is principally due to the increase in capital expenditures associated with our GOP (Note 10).