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LEASES - Weighted-average remaining lease term and weighted-average discount rate (Details)
Mar. 31, 2020
Dec. 31, 2019
LEASES    
Weighted-average remaining lease term (years), Operating Leases 9 years 9 months 18 days 10 years 1 month 6 days
Weighted-average remaining lease term (years), Finance Leases 9 months 18 days 7 months 6 days
Weighted-average discount rate, Operating Leases 3.20% 3.10%
Weighted-average discount rate, Finance Leases 2.70% 2.90%