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LEASES - Weighted-average remaining lease term and weighted-average discount rate (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Weighted Average Remaining Lease Term (Years)  
Operating leases 8 years 3 months 18 days
Finance leases 3 years 8 months 12 days
Weighted Average Discount Rate  
Operating leases 4.80%
Finance leases 5.40%
Rent expense $ 335