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Fair Value Measurements - Debt Securities Available for Sale Reconciliation (Details) - Items measured on a recurring basis - Level 3 Inputs - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Equity Investments |  |  |  |
Debt Securities, Available For Sale, Fair Value [Roll Forward] |  |  |  |
Beginning balance | $ 2,978 |  | $ 2,540 |
Total losses included in earnings | (622) |  | (184) |
Purchases | 0 |  | 0 |
Ending balance | $ 2,356 |  | $ 2,356 |
Debt Securities |  |  |  |
Debt Securities, Available For Sale, Fair Value [Roll Forward] |  |  |  |
Beginning balance |  | $ 2,402 |  | $ 25
Total losses included in earnings |  | 0 |  | 0
Purchases |  | 0 |  | 2,377
Ending balance |  | $ 2,402 |  | $ 2,402

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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