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Note 7. Restricted marketable securities (Details) - Restricted marketable securities - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Restricted marketable securities	$ 199,136	$ 198,310
Product minimum service life	25 years
Restricted debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Restricted marketable securities	$ 199,136	198,310
Payments to acquire restricted marketable securities	7,900
Noncurrent restricted cash, held in trust [Member]
Debt Securities, Available-for-sale [Line Items]
Restricted cash and cash equivalents - noncurrent	5,000	6,200
U.S. debt [Member] | Restricted debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Restricted marketable securities	109,155	113,326
Foreign government obligations [Member] | Restricted debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Restricted marketable securities	49,024	51,229
Supranational debt [Member] | Restricted debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Restricted marketable securities	22,809	15,339
U.S. government obligations [Member] | Restricted debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Restricted marketable securities	$ 18,148	$ 18,416

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The cash outflow to acquire investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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