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LEASES - Undiscounted future lease payments for operating and finance leases (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Operating Leases  
2020 $ 3,661
2021 2,990
2022 3,213
2023 3,025
2024 2,737
2025 and thereafter 18,188
Total lease payments 33,814
Less imputed interest (5,351)
Total $ 28,463
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent us-gaap:OtherLiabilitiesNoncurrent
Finance Leases  
2020 $ 1,500
Total lease payments 1,500
Less imputed interest (15)
Total 1,485
Accrued liabilities, Operating Leases $ 2,812
Accrued liabilities, Operating Leases us-gaap:AccruedLiabilitiesCurrent
Accrued liabilities, Finance Leases $ 1,485
Other liabilities, Operating Leases $ 25,651
Other liabilities, Operating Leases us-gaap:OtherLiabilitiesNoncurrent