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LEASES - Operating and finance leases liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Operating Leases $ 20,513 $ 28,463
Finance Leases $ 823 $ 1,485
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesMember us-gaap:OtherLiabilitiesMember us-gaap:AccruedLiabilitiesMember us-gaap:OtherLiabilitiesMember
Accrued liabilities    
Lessee, Lease, Description [Line Items]    
Operating Leases $ 3,171 $ 2,812
Finance Leases 799 1,485
Other Liabilities    
Lessee, Lease, Description [Line Items]    
Operating Leases 17,342 $ 25,651
Finance Leases $ 24