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LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
LEASES |  |
2019 (excluding the nine months ended September 30, 2019) | $ 4,247 |
2020 | 13,516 |
2021 | 13,510 |
2022 | 12,551 |
2023 | 10,693 |
Thereafter | 28,062 |
Total lease payments | 82,579 |
Less imputed interest | (13,002) |
Total | $ 69,577 |
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 lease payments |  | $ 83,970

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