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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

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