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Fair Value Measurements and Disclosures - Assets and Liabilities Reported at Fair Value (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair value adjustment of marketable securities and deferred compensation plan liability |  |  |
Net gain on marketable securities | $ 3,612 | $ 2,864 | $ 3,885
Fair value, measurements, recurring | Fair Value (Level 1) |  |  |
Assets and Liabilities Reported at Fair Value |  |  |
Marketable securities | $ 27,475 | $ 27,481 |

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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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- Definition Amount of unrealized and realized gain (loss) on investment in marketable security, excluding other-than-temporary impairment (OTTI). + References No definition available. + Details
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