LEASES - Maturities of lease liabilities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Maturities of lease liabilities
2019	$ 2,316
2020	4,594
2021	4,477
2022	4,212
2023	3,690
Thereafter	17,004
Total future minimum payments	36,293
Less imputed interest	(9,067)
Total lease liability	$ 27,226