RESTRUCTURING - Accrued Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Restructuring Reserve [Roll Forward]
Accrued restructuring costs, beginning balance	$ 7,157	$ 10,061	$ 4,746	$ 4,746
Restructuring costs incurred during the period	4,034	0	9,956	13,990	$ 16,000
Amount paid during the period	(3,234)	(2,904)	(4,641)
Accrued restructuring costs, ending balance	$ 7,957	$ 7,157	$ 10,061	$ 7,957	$ 4,746