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INVESTMENTS (Available For Sale Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 10,800 $ 10,800
Gross Unrealized Gains 0 0
Gross Unrealized Losses (730) (730)
Fair Value 10,070 10,070
Aggregate Fair Value 10,070 10,070
Gross Unrealized Losses (730) (730)
Auction Rate Securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 10,800 10,800
Gross Unrealized Gains 0 0
Gross Unrealized Losses (730) (730)
Fair Value 10,070 10,070
Aggregate Fair Value 10,070 10,070
Gross Unrealized Losses $ (730) $ (730)