Other Financial Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Net (increase) decrease in operating working capital, excluding cash and cash equivalents:
(Increase) in accounts receivable	$ (18,915)	$ (263,104)
(Increase) decrease in inventories	(8,353)	(10,092)
(Increase) decrease in prepaid expenses	8,291	(1,693)
Increase in accounts payable and accrued liabilities	6,642	147,790
Increase (decrease) in income taxes payable	(3,005)	5,501
Net increase in noncash working capital	(15,340)	(121,598)
Supplementary disclosures:
Cash income taxes paid, net of refunds	10,904	1,783
Interest paid, net of amounts capitalized of $6.8 million in 2023 and $10.4 million in 2022	54,305	78,747
Non-cash investing activities:
Asset retirement costs capitalized	2,742	9,007
(Increase) decrease in capital expenditure accrual	20,522	(1,929)
Interest paid, amount capitalized	$ 6,800	$ 10,400