Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value Measurements
Marketable securities	$ 878,608	$ 601,989
Recurring \| Estimate of Fair Value Measurement
Fair Value Measurements
Marketable securities	878,608	601,989
Investments in Other Companies	19,524
Cash and cash equivalents	96,071	258,421
Total Assets Measured at Fair Value	994,203	860,410
Cost of cash and cash equivalents and available for sale securities	977,200	860,400
Recurring \| Estimate of Fair Value Measurement \| Corporate Bond Securities
Fair Value Measurements
Marketable securities	484,794	54,673
Recurring \| Estimate of Fair Value Measurement \| Commercial Paper
Fair Value Measurements
Marketable securities	393,814	547,316
Recurring \| Level 1
Fair Value Measurements
Investments in Other Companies	6,200
Cash and cash equivalents	96,071	258,421
Total Assets Measured at Fair Value	102,271	258,421
Recurring \| Level 2
Fair Value Measurements
Marketable securities	878,608	601,989
Total Assets Measured at Fair Value	878,608	601,989
Recurring \| Level 2 \| Corporate Bond Securities
Fair Value Measurements
Marketable securities	484,794	54,673
Recurring \| Level 2 \| Commercial Paper
Fair Value Measurements
Marketable securities	393,814	$ 547,316
Recurring \| Level 3
Fair Value Measurements
Investments in Other Companies	13,324
Total Assets Measured at Fair Value	$ 13,324

Represents information pertaining to amortized cost of cash and cash equivalents and available for sale securities.

No definition available.

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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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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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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