LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lease, Cost [Abstract]
Operating Lease, Cost	$ 1,831	$ 1,972	$ 5,532	$ 5,973
Short-term Lease, Cost	26	30	81	111
Variable Lease, Cost	656	632	2,011	1,899
Lease, Cost	$ 2,513	$ 2,634	$ 7,624	$ 7,983