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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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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477220/954-210-45-4 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 954 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478600/954-210-50-2 + Details
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