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INVESTMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	$ 1,525	$ 5,970
Municipal Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost, Current	1,525	5,970
Amortized Cost, Due from one through five years	9,752	10,260
Amortized Cost, Due from six through ten years	6,239	5,005
Amortized Cost, Due from eleven through twenty years	2,711	2,404
Amortized Cost, Total	20,227	23,639
Market Value, Current	1,532	5,977
Market Value, Due from one through five years	9,861	10,536
Market Value, Due from six through ten years	6,433	5,197
Market Value, Due from eleven through twenty years	2,713	2,539
Market Value, Total	$ 20,539	$ 24,249

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