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LEASES - Supplemental balance sheet information (Details)
Jun. 30, 2021
Dec. 31, 2020
LEASES    
Weighted-average Remaining Lease Term, Operating leases 7 years 2 months 23 days 7 years 4 months 28 days
Weighted-average Remaining Lease Term, Finance lease 9 years 2 months 4 days 9 years 8 months 1 day
Weighted-average Discount Rate, Operating leases 4.50% 4.51%