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LEASES - Operating and finance leases liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Operating Leases $ 28,114 $ 28,463
Finance Leases 2,209 1,485
Accrued liabilities    
Lessee, Lease, Description [Line Items]    
Operating Leases 2,830 2,812
Finance Leases 2,209 1,485
Other Liabilities    
Lessee, Lease, Description [Line Items]    
Operating Leases $ 25,284 $ 25,651