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INVESTMENTS - Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	$ 219	$ 2,215
Municipal bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	219	2,215
Amortized Cost, Due from one through five years	6,503	7,420
Amortized Cost, Due from six through ten years	2,479	3,057
Amortized Cost, Due from eleven through twenty years	1,014	2,323
Amortized Cost, Total	10,215	15,015
Market Value, Current	223	2,249
Market Value, Due from one through five years	6,805	7,830
Market Value, Due from six through ten years	2,790	3,608
Market Value, Due from eleven through twenty years	1,102	2,547
Market Value, Total	$ 10,920	$ 16,234

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