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LEASES - Weighted Average Remaining Lease Term and Weighted Average Discount Rate (Details)
Sep. 30, 2020
Dec. 31, 2019
Weighted average remaining lease term:    
Operating 3 years 3 months 18 days 3 years 9 months 18 days
Finance 3 years 2 years
Weighted average discount rate:    
Operating 4.20% 4.40%
Finance 2.20% 4.00%