Other Financial Information (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024
Net (increase) decrease in operating working capital, excluding cash and cash equivalents:
(Increase) decrease in accounts receivable	$ (7,567)	$ 80,603
(Increase) decrease in inventories	(9,532)	1,823
(Increase) decrease in prepaid expenses	15	(8,131)
Increase (decrease) in accounts payable and accrued liabilities	(5,373)	(43,231)
Increase (decrease) in income taxes payable	1,984	771
Net decrease (increase) in non-cash working capital	(20,473)	31,835
Supplementary disclosures:
Net cash income taxes paid	9,217	12,519
Interest paid, net of amounts capitalized of $5.3 million in 2025 and $10.8 million in 2024	52,426	48,708
Non-cash investing activities:
Asset retirement costs capitalized	21,756	19,949
(Increase) decrease in capital expenditure accrual	34,210	(2,177)
Interest paid, amount capitalized	$ 5,300	$ 10,800

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Noncash additions to property, plant and equipment for asset retirement costs capitalized.

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