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BORROWINGS - Revolving Credit Agreement (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Aug. 02, 2019
Line of Credit Facility [Line Items]      
Outstanding borrowings $ 0 $ 10,500  
Unsecured revolving credit agreement      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity     $ 30,000
Outstanding borrowings $ 0 $ 10,500