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Other assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Restricted cash	$ 39,478	$ 19,897
Pension and OPEB plan assets (note 10)	84,490	48,477
Income taxes recoverable	10,665	8,751
Deferred financing costs	2,560	26,211
Insurance recoveries (note 21)	0	66,000
Other	39,189	30,867
Total other assets	176,382	200,203
Less: current portion	(12,760)	(15,800)
Other assets (note 11)	$ 163,622	$ 184,403

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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