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LEASES - Maturities of lease liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
LEASES    
2020 (excluding the six months ended June 30, 2020) $ 7,659  
2020   $ 14,526
2021 14,279 13,714
2022 13,019 12,787
2023 10,737 10,713
2024 9,638 9,671
Thereafter 19,329 18,355
Total lease payments 74,661 79,766
Less imputed interest (10,928) (12,195)
Total $ 63,733 $ 67,571
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent