Supplemental Cash Flow Information

12 Months Ended

Dec. 31, 2020

Supplemental Cash Flow Elements [Abstract]

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


	Year Ended December 31,
	2020		2019		2018
(Increase) decrease in:
Accounts receivable	$	88,116	$	(80,126)	$	130,573
Inventories	(34,740)		7,659		20,963
Deferred charges	24,590		4,093		(5,826)
Other current assets	1,188		(4,874)		9,337
Increase (decrease) in:
Accounts payable	(9,742)		81,915		(130,991)
Accrued liabilities	(30,785)		(79,765)		(26,208)
Net changes in components of operating assets and liabilities	$	38,627	$	(71,098)	$	(2,152)

Payments of interest and commitment fees were $200.6 million, $212.4 million and $228.3 million during the years ended December 31, 2020, 2019 and 2018, respectively. We capitalized interest of $1.9 million, $3.7 million and $3.4 million during the years ended December 31, 2020, 2019 and 2018.

During the years ended December 31, 2020, 2019 and 2018, we paid taxes of $0.8 million, $0.8 million and $0.2 million.

At December 31, 2020, 2019 and 2018, we had incurred liabilities for fixed and intangible asset additions totaling $29.1 million, $22.6 million and $9.4 million, respectively, which had not been paid at the end of the year. Therefore, these amounts were not included in the caption “Payments to acquire fixed and intangible assets” under Cash Flows from Investing Activities in the Consolidated Statements of Cash Flows.