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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value Disclosures [Abstract] |  |  |
Unrealized gain (loss) on available-for-sale marketable securities, net of taxes | $ 2,761 | $ (679) | $ 1,156
Quoted Prices in Active Markets (Level 1) | RSP |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unrealized gain related to equity securities | 7,400 |  |
Unrealized loss related to equity securities |  | (1,300) |
Municipal bonds — available-for-sale |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Proceeds from available for sale municipal bonds | 21,300 | 9,000 | 28,500
Realized loss (less than $0.2 million for 2018 and less than $0.1 for 2017) | $ 100 | $ 200 | $ 100

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563 + Details
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