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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances from Contracts with Customers (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balances from contracts with customers only:    
Other Assets $ 1,121 $ 1,703
Other Liabilities $ 2,785 $ 3,114
Revenue, Practical Expedient, Incremental Cost of Obtaining Contract [true false] true