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Investments - Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost, Current | $ 1,493 | $ 2,215
Municipal bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost, Current | 1,493 | 2,215
Amortized Cost, Due from one through five years | 6,666 | 7,420
Amortized Cost, Due from six through ten years | 2,635 | 3,057
Amortized Cost, Due from eleven through twenty years | 1,611 | 2,323
Amortized Cost, Total | 12,405 | 15,015
Market Value, Current | 1,505 | 2,249
Market Value, Due from one through five years | 7,003 | 7,830
Market Value, Due from six through ten years | 3,106 | 3,608
Market Value, Due from eleven through twenty years | 1,764 | 2,547
Market Value, Total | $ 13,378 | $ 16,234

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