LEASES - Operating and finance leases liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating Leases	$ 20,517	$ 28,463
Finance Leases	1,214	1,485
Accrued liabilities
Lessee, Lease, Description [Line Items]
Operating Leases	2,982	2,812
Finance Leases	1,214	1,485
Other Liabilities
Lessee, Lease, Description [Line Items]
Operating Leases	$ 17,535	$ 25,651