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INVESTMENTS - Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost, Current | $ 5,904 | $ 1,525
Municipal Bonds [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost, Current | 5,904 | 1,525
Amortized Cost, Due from one through five years | 8,336 | 9,752
Amortized Cost, Due from six through ten years | 4,255 | 6,239
Amortized Cost, Due from eleven through twenty years | 3,223 | 2,711
Amortized Cost, Total | 21,718 | 20,227
Market Value, Current | 5,915 | 1,532
Market Value, Due from one through five years | 8,621 | 9,861
Market Value, Due from six through ten years | 4,618 | 6,433
Market Value, Due from eleven through twenty years | 3,430 | 2,713
Market Value, Total | $ 22,584 | $ 20,539

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