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LEASES - Lease Term and Discount Rate (Details)
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Weighted-average remaining lease term, operating 4 years 4 years
Weighted-average remaining lease term, finance 7 years 7 years
Weighted-average discount rate, operating 3.70% 3.70%
Weighted-average discount rate, finance 8.30% 8.00%