LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
LEASES
2020 (excluding the three months ended March 31, 2020)	$ 11,097
2020		$ 14,526
2021	13,748	13,714
2022	12,773	12,787
2023	10,561	10,713
2024	9,532	9,671
Thereafter	18,572	18,355
Total lease payments	76,283	79,766
Less imputed interest	(11,384)	(12,195)
Total	$ 64,899	$ 67,571
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent	us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent