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Investments - Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost, Current | $ 702 | $ 219
Municipal bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost, Current | 702 | 219
Amortized Cost, Due from one through five years | 5,224 | 6,503
Amortized Cost, Due from six through ten years | 2,505 | 2,479
Amortized Cost, Due from eleven through twenty years | 799 | 1,014
Amortized Cost, Total | 9,230 | 10,215
Market Value, Current | 703 | 223
Market Value, Due from one through five years | 5,257 | 6,805
Market Value, Due from six through ten years | 2,595 | 2,790
Market Value, Due from eleven through twenty years | 761 | 1,102
Market Value, Total | $ 9,316 | $ 10,920

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