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LEASES - Weighted Average Lease Term and Discount Rate (Details)
Dec. 31, 2020
Dec. 31, 2019
Weighted-average remaining lease term:    
Operating leases 10 years 10 years
Finance leases 10 years 11 years
Weighted-average discount rate:    
Operating leases 4.40% 4.60%
Finance leases 3.30% 3.40%