LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
LEASES
Operating lease cost	$ 746	$ 829	$ 1,492	$ 1,809
Short-term lease cost	275	317	583	613
Total lease cost	$ 1,021	$ 1,146	$ 2,075	$ 2,422