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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 + Details
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