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LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
LEASES |  |
2020 | $ 14,526 |
2021 | 13,714 |
2022 | 12,787 |
2023 | 10,713 |
2024 | 9,671 |
Thereafter | 18,355 |
Total lease payments | 79,766 |
Less imputed interest | (12,195) |
Total | $ 67,571 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent |
Maturities of lease liabilities as of December 31, 2018 |  |
2019 |  | $ 11,801
2020 |  | 12,650
2021 |  | 11,491
2022 |  | 10,713
2023 |  | 9,990
Thereafter |  | 27,325
Total obligations under operating leases |  | $ 83,970

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