LEASES - Maturities of lease liabilities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Maturities of lease liabilities
2019	$ 2,210
2020	2,876
2021	2,836
2022	2,587
2023	2,067
Thereafter	14,574
Total future minimum payments	27,150
Less imputed interest	(8,315)
Total lease liability	$ 18,835