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LEASES - Weighted Average Remaining Lease Term and Weighted Average Discount Rate (Details)
Dec. 31, 2020
Dec. 31, 2019
Weighted average remaining lease term:    
Operating 3 years 1 month 6 days 3 years 9 months 18 days
Finance 2 years 10 months 24 days 2 years
Weighted average discount rate:    
Operating 4.20% 4.40%
Finance 2.10% 4.00%