LEASES - Operating and finance leases liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Operating Leases	$ 18,211	$ 20,513
Finance Leases	1,617	823
Accrued liabilities
Lessee, Lease, Description [Line Items]
Operating Leases	2,849	3,171
Finance Leases	1,571	799
Other Liabilities
Lessee, Lease, Description [Line Items]
Operating Leases	15,362	17,342
Finance Leases	$ 46	$ 24