LEASES - Schedule of Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating lease expense:
Operating lease expense	$ 696	$ 1,294	$ 3,103	$ 3,958
Finance lease expense:
Amortization of leased assets		221	324	664
Interest on lease liabilities		24	10	93
Total finance lease expense		245	334	757
Total lease expense	$ 696	$ 1,539	$ 3,437	$ 4,715