Other Financial Information (Tables)

9 Months Ended

Sep. 30, 2021

Other Financial Information [Abstract]

Noncash Operating Working Capital (Increase) Decrease

Additional disclosures regarding cash flow activities are provided below.

	Nine Months Ended September 30,
(Thousands of dollars)	2021		2020
Net (increase) decrease in operating working capital, excluding cash and cash equivalents:
Decrease in accounts receivable ¹	$	75,100	251,706
Decrease in inventories	9,718		4,747
(Increase) in prepaid expenses	(6,682)		(17,400)
Increase (decrease) in accounts payable and accrued liabilities ¹	40,687		(264,078)
(Decrease) in income taxes payable	(1,493)		(1,236)
Net (increase) decrease in noncash operating working capital	$	117,330	(26,261)
Supplementary disclosures:
Cash income taxes paid, net of refunds	$	1,685	(12,559)
Interest paid, net of amounts capitalized of $11.6 million in 2021 and $5.9 million in 2020	127,793		139,651
Non-cash investing activities:
Asset retirement costs capitalized ²	$	36,300	6,342
Decrease in capital expenditure accrual	31,301		74,742

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

2 Excludes non-cash capitalized cost offset by impairment of $74.4 million in the first quarter of 2021 and a gain in other operating income of $71.8 million following a commercial agreement to sanction an asset life extension project at Terra Nova in the third quarter of 2021, which extended the life of Terra Nova by approximately 10 years.