Other Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Net (increase) decrease in operating working capital, excluding cash and cash equivalents:
Decrease (increase) in accounts receivable		$ (130,792)	$ 75,100
(Increase) decrease in inventories		(410)	9,718
(Increase) in prepaid expenses		(8,561)	(6,682)
Increase in accounts payable and accrued liabilities		61,139	40,687
Increase (decrease) in income taxes payable		18,750	(1,493)
Net (increase) decrease in noncash operating working capital		(59,874)	117,330
Supplementary disclosures:
Cash income taxes paid, net of refunds		16,493	1,685
Interest paid, net of amounts capitalized of $13.2 million in 2022 and $11.6 million in 2021		112,332	127,793
Non-cash investing activities:
Asset retirement costs capitalized		29,327	36,300
Decrease in capital expenditure accrual		34,853	31,301
Interest paid, amount capitalized		$ 13,200	$ 11,600
Terra Nova
Business Acquisition [Line Items]
Impairment of asset retirement obligation				$ 74,400
Gain of asset retirement obligation				$ 71,800
Asset life extension period	10 years