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LEASES - Supplemental cash flow information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash outflows from operating leases $ 3,982 $ 4,077
Operating cash outflows from finance leases 39 56
Financing cash outflows from finance leases 3,086 2,223
ROU assets obtained in exchange for lease obligations:    
Finance leases 2,417 2,866
Operating leases $ 3,003 $ 34,931