Other Financial Information (Tables)

6 Months Ended

Jun. 30, 2020

Other Financial Information [Abstract]

Noncash Operating Working Capital (Increase) Decrease

Additional disclosures regarding cash flow activities are provided below.໿

	Six Months Ended June 30,
(Thousands of dollars)	2020		2019
Net (increase) decrease in operating working capital, excluding cash and cash equivalents:
(Increase) decrease in accounts receivable ¹	$	227,710	(141,793)
(Increase) decrease in inventories	13,968		(617)
(Increase) decrease in prepaid expenses	(20,712)		(12,190)
Increase (decrease) in accounts payable and accrued liabilities ¹	(219,228)		147,569
Increase (decrease) in income taxes payable	(403)		1,665
Net (increase) decrease in noncash operating working capital	$	1,335	(5,366)
Supplementary disclosures:
Cash income taxes paid, net of refunds	$	(7)	79
Interest paid, net of amounts capitalized of $4.9 million in 2020 and $0 million in 2019	100,745		102,802
Non-cash investing activities:
Asset retirement costs capitalized ²	$	6,342	38,396
(Increase) decrease in capital expenditure accrual	58,602		(65,830)

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

² 2019 includes asset retirement obligations assumed as part of the LLOG acquisition of $37.3 million. See Note P.