Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2025	Dec. 31, 2024
Fair Value Measurements
Marketable Securities	$ 571,911	$ 574,266
Maximum period for redemption	1 year	1 year
Marketable securities at cost	$ 571,800	$ 574,000
Recurring \| Estimate of Fair Value Measurement
Fair Value Measurements
Marketable Securities	571,911	574,266
Investments in Other Companies	4,980	8,160
Cash and Cash Equivalents	178,973	227,362
Total Assets Measured at Fair Value	755,864	809,788
Recurring \| Estimate of Fair Value Measurement \| Bonds and bond funds
Fair Value Measurements
Marketable Securities	256,362	462,333
Recurring \| Estimate of Fair Value Measurement \| Commercial Paper
Fair Value Measurements
Marketable Securities	315,549	111,933
Recurring \| Level 1
Fair Value Measurements
Cash and Cash Equivalents	178,973	227,362
Total Assets Measured at Fair Value	178,973	227,362
Recurring \| Level 2
Fair Value Measurements
Marketable Securities	571,911	574,266
Total Assets Measured at Fair Value	571,911	574,266
Recurring \| Level 2 \| Bonds and bond funds
Fair Value Measurements
Marketable Securities	256,362	462,333
Recurring \| Level 2 \| Commercial Paper
Fair Value Measurements
Marketable Securities	315,549	111,933
Recurring \| Level 3
Fair Value Measurements
Investments in Other Companies	4,980	8,160
Total Assets Measured at Fair Value	$ 4,980	$ 8,160

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- Definition

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

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- Definition

Fair value portion of asset recognized for present right to economic benefit.

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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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- 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.

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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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- Definition

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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