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LEASES - Undiscounted future lease payments for operating and finance leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Operating Leases    
2021 $ 3,785  
2022 3,131  
2023 2,387  
2024 1,899  
2025 1,603  
2026 and thereafter 11,588  
Total lease payments 24,393  
Less imputed interest (3,880)  
Total $ 20,513 $ 28,463
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesMember us-gaap:OtherLiabilitiesMember us-gaap:AccruedLiabilitiesMember us-gaap:OtherLiabilitiesMember
Finance Leases    
2021 $ 803  
2022 11  
2023 11  
2024 3  
Total lease payments 828  
Less imputed interest (5)  
Total $ 823 $ 1,485