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Investments - Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost, Current | $ 751 | $ 2,215
Municipal bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost, Current | 751 | 2,215
Amortized Cost, Due from one through five years | 6,705 | 7,420
Amortized Cost, Due from six through ten years | 2,734 | 3,057
Amortized Cost, Due from eleven through twenty years | 1,199 | 2,323
Amortized Cost, Total | 11,389 | 15,015
Market Value, Current | 755 | 2,249
Market Value, Due from one through five years | 7,050 | 7,830
Market Value, Due from six through ten years | 3,188 | 3,608
Market Value, Due from eleven through twenty years | 1,300 | 2,547
Market Value, Total | $ 12,293 | $ 16,234

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