LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
LEASES
Operating lease cost	$ 674	$ 749	$ 2,167	$ 2,558
Short-term lease cost	298	294	881	907
Total lease cost	$ 972	$ 1,043	$ 3,048	$ 3,465