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Fair Value Measurements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 | Dec. 31, 2025
Fair Value Measurements |  |
Marketable Securities | $ 561,413 | $ 584,236
Maximum period for redemption | 1 year | 1 year
Marketable securities at cost | $ 561,900 | $ 583,900
Recurring | Fair Value |  |
Fair Value Measurements |  |
Marketable Securities | 561,413 | 584,236
Investments in Other Companies | 2,643 | 4,253
Cash and Cash Equivalents | 65,841 | 122,673
Total Assets Measured at Fair Value | 629,897 | 711,162
Recurring | Fair Value | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable Securities | 521,186 | 487,699
Recurring | Fair Value | Commercial paper |  |
Fair Value Measurements |  |
Marketable Securities | 40,227 | 96,537
Recurring | Level 1 |  |
Fair Value Measurements |  |
Investments in Other Companies | 2,643 | 4,253
Cash and Cash Equivalents | 65,841 | 122,673
Total Assets Measured at Fair Value | 68,484 | 126,926
Recurring | Level 2 |  |
Fair Value Measurements |  |
Marketable Securities | 561,413 | 584,236
Total Assets Measured at Fair Value | 561,413 | 584,236
Recurring | Level 2 | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable Securities | 521,186 | 487,699
Recurring | Level 2 | Commercial paper |  |
Fair Value Measurements |  |
Marketable Securities | $ 40,227 | $ 96,537

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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