Supplemental Cash Flow Information

3 Months Ended

Mar. 31, 2021

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

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,
	2021		2020
(Increase) decrease in:
Accounts receivable	$	(99,504)	$	101,405
Inventories	27,450		(5,024)
Deferred charges	7,731		2,783
Other current assets	(2,294)		(3,746)
Increase (decrease) in:
Accounts payable	38,994		(62,365)
Accrued liabilities	22,561		(25,519)
Net changes in components of operating assets and liabilities	$	(5,062)	$	7,534

Payments of interest and commitment fees were $35.4 million and $33.7 million for the 2021 Quarter and 2020 Quarter, respectively. We capitalized interest of $0.7 million and $0.5 million during the 2021 Quarter and 2020 Quarter, respectively.

At March 31, 2021 and March 31, 2020, we had incurred liabilities for fixed and intangible asset additions totaling $27.1 million and $17.2 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.