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LEASES - Supplemental cash flow information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 2,084 $ 2,032
Operating cash flows from finance leases 25 30
Financing cash flows from finance leases 1,680 932
ROU assets obtained in exchange for lease obligations:    
Finance leases 2,024 1,252
Operating leases $ 2,020 $ 27,224