RESTRUCTURING CHARGES - Restructuring charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 5,671	$ 11,981	$ 6,976
Workforce reduction
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	5,521	11,885	6,171
Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 150	$ 96	$ 805