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Fair Value Measurements (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Fair Value Measurements |  |
Marketable Securities | $ 658,433 | $ 686,946
Maximum period for redemption | 1 year | 1 year
Marketable securities at cost | $ 657,900 | $ 686,500
Recurring | Estimate of Fair Value Measurement |  |
Fair Value Measurements |  |
Marketable Securities | 658,433 | 686,946
Investments in Other Companies | 4,860 | 15,402
Cash and Cash Equivalents | 177,609 | 148,277
Total Assets Measured at Fair Value | 840,902 | 850,625
Recurring | Estimate of Fair Value Measurement | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable Securities | 578,812 | 677,074
Recurring | Estimate of Fair Value Measurement | Commercial Paper |  |
Fair Value Measurements |  |
Marketable Securities | 79,621 | 9,872
Recurring | Level 1 |  |
Fair Value Measurements |  |
Investments in Other Companies |  | 2,925
Cash and Cash Equivalents | 177,609 | 148,277
Total Assets Measured at Fair Value | 177,609 | 151,202
Recurring | Level 2 |  |
Fair Value Measurements |  |
Marketable Securities | 658,433 | 686,946
Total Assets Measured at Fair Value | 658,433 | 686,946
Recurring | Level 2 | Bonds and bond funds |  |
Fair Value Measurements |  |
Marketable Securities | 578,812 | 677,074
Recurring | Level 2 | Commercial Paper |  |
Fair Value Measurements |  |
Marketable Securities | 79,621 | 9,872
Recurring | Level 3 |  |
Fair Value Measurements |  |
Investments in Other Companies | 4,860 | 12,477
Total Assets Measured at Fair Value | $ 4,860 | $ 12,477

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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/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 2: 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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