Fair Value Measurements (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2026	Dec. 31, 2025
Fair Value Measurements
Marketable Securities	$ 497,177	$ 584,236
Maximum period for redemption	1 year	1 year
Marketable securities at cost	$ 498,300	$ 583,900
Recurring \| Fair Value
Fair Value Measurements
Marketable Securities	497,177	584,236
Investments in Other Companies	2,057	4,253
Cash and Cash Equivalents	71,751	122,673
Total Assets Measured at Fair Value	570,985	711,162
Recurring \| Fair Value \| Bonds and bond funds
Fair Value Measurements
Marketable Securities	469,718	487,699
Recurring \| Fair Value \| Commercial paper
Fair Value Measurements
Marketable Securities	27,459	96,537
Recurring \| Level 1
Fair Value Measurements
Investments in Other Companies	2,057	4,253
Cash and Cash Equivalents	71,751	122,673
Total Assets Measured at Fair Value	73,808	126,926
Recurring \| Level 2
Fair Value Measurements
Marketable Securities	497,177	584,236
Total Assets Measured at Fair Value	497,177	584,236
Recurring \| Level 2 \| Bonds and bond funds
Fair Value Measurements
Marketable Securities	469,718	487,699
Recurring \| Level 2 \| Commercial paper
Fair Value Measurements
Marketable Securities	$ 27,459	$ 96,537

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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 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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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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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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