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LEASES - Supplemental cash flow information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash outflows from operating leases $ 2,008 $ 2,084
Operating cash outflows from finance leases 9 25
Financing cash outflows from finance leases 1,297 1,680
ROU assets obtained in exchange for lease obligations:    
Finance leases 2,238 2,024
Operating leases $ 166 $ 2,020