Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2024	Dec. 31, 2023
Fair Value Measurements
Marketable Securities	$ 641,185	$ 686,946
Maximum period for redemption	1 year	1 year
Marketable securities at cost	$ 641,000	$ 686,500
Recurring \| Estimate of Fair Value Measurement
Fair Value Measurements
Marketable Securities	641,185	686,946
Investments in Other Companies	11,904	15,402
Cash and Cash Equivalents	179,979	148,277
Total Assets Measured at Fair Value	833,068	850,625
Recurring \| Estimate of Fair Value Measurement \| Bonds and bond funds
Fair Value Measurements
Marketable Securities	628,994	677,074
Recurring \| Estimate of Fair Value Measurement \| Commercial Paper
Fair Value Measurements
Marketable Securities	12,191	9,872
Recurring \| Level 1
Fair Value Measurements
Investments in Other Companies	2,158	2,925
Cash and Cash Equivalents	179,979	148,277
Total Assets Measured at Fair Value	182,137	151,202
Recurring \| Level 2
Fair Value Measurements
Marketable Securities	641,185	686,946
Total Assets Measured at Fair Value	641,185	686,946
Recurring \| Level 2 \| Bonds and bond funds
Fair Value Measurements
Marketable Securities	628,994	677,074
Recurring \| Level 2 \| Commercial Paper
Fair Value Measurements
Marketable Securities	12,191	9,872
Recurring \| Level 3
Fair Value Measurements
Investments in Other Companies	9,746	12,477
Total Assets Measured at Fair Value	$ 9,746	$ 12,477

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The amount of cost of marketable securities as at the end of the reporting period.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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

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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.

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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