Other Financial Information

3 Months Ended

Mar. 31, 2021

Other Financial Information [Abstract]

Other Financial Information

Note G – Other Financial Information

Additional disclosures regarding cash flow activities are provided below.

	Three Months Ended March 31,
(Thousands of dollars)	2021		2020
Net (increase) decrease in operating working capital, excluding cash and cash equivalents:
(Increase) decrease in accounts receivable ¹	$	(16,954)	186,436
Decrease in inventories	392		7,553
(Increase) in prepaid expenses	(3,652)		(10,179)
Increase (decrease) in accounts payable and accrued liabilities ¹	11,810		(76,287)
Increase (decrease) in income taxes payable	(648)		304
Net (increase) decrease in noncash operating working capital	$	(9,052)	107,827
Supplementary disclosures:
Cash income taxes paid, net of refunds	$	720	72
Interest paid, net of amounts capitalized of $3.3 million in 2021 and $2.4 million in 2020	44,577		42,344
Non-cash investing activities:
Asset retirement costs capitalized ²	$	6,390	280
Decrease in capital expenditure accrual	13,617		10,633

1 Excludes receivable/payable balances relating to mark-to-market of crude contracts and contingent consideration relating to acquisitions.

2 Excludes non-cash capitalized cost offset by impairment of $74.4 million in 2021.