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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets, Fair Value Disclosure	$ 566,864	$ 601,011
Mutual funds
Assets, Fair Value Disclosure	105,536	110,006
U.S. Treasury notes
Assets, Fair Value Disclosure	316,939	223,896
Corporate debt securities
Assets, Fair Value Disclosure	42,588	155,796
Money market mutual fund
Assets, Fair Value Disclosure	101,801	111,313
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure	566,864	601,011
Fair Value, Inputs, Level 1 [Member] | Mutual funds
Assets, Fair Value Disclosure	105,536	110,006
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury notes
Assets, Fair Value Disclosure	316,939	223,896
Fair Value, Inputs, Level 1 [Member] | Corporate debt securities
Assets, Fair Value Disclosure	42,588	155,796
Fair Value, Inputs, Level 1 [Member] | Money market mutual fund
Assets, Fair Value Disclosure	$ 101,801	$ 111,313

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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