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INVESTMENTS - Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost, Current | $ 2,215 | $ 5,904
Municipal Bonds [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost, Current | 2,215 | 5,904
Amortized Cost, Due from one through five years | 7,420 | 8,336
Amortized Cost, Due from six through ten years | 3,057 | 4,255
Amortized Cost, Due from eleven through twenty years | 2,323 | 3,223
Amortized Cost, Total | 15,015 | 21,718
Market Value, Current | 2,249 | 5,915
Market Value, Due from one through five years | 7,830 | 8,621
Market Value, Due from six through ten years | 3,608 | 4,618
Market Value, Due from eleven through twenty years | 2,547 | 3,430
Market Value, Total | $ 16,234 | $ 22,584

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