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INVESTMENTS - Current and Noncurrent Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]    
Current investments $ 19,780 $ 8,635
Financial assets, classified as held for trading 418 527
Noncurrent investments 418 527
Mutual funds    
Disclosure of financial assets [line items]    
Held for trading investment 19,384 4,050
Financial assets, classified as held for trading   527
LETEs    
Disclosure of financial assets [line items]    
Current financial assets available-for-sale 396 1,015
T-Bills    
Disclosure of financial assets [line items]    
Current financial assets available-for-sale 0 3,493
LECAPs    
Disclosure of financial assets [line items]    
Current financial assets available-for-sale $ 0 $ 77