COMMITMENTS AND CONTINGENCIES - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
COMMITMENTS AND CONTINGENCIES
Cash outflows for operating leases	$ 1,078	$ 756	$ 2,287	$ 1,970
Weighted average remaining lease term (years)	18 years 6 months 26 days	19 years 7 months 10 days	18 years 6 months 26 days	19 years 7 months 10 days
Weighted average discount rate	5.20%	5.20%	5.20%	5.20%