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RESTRUCTURING AND RELATED CHARGES - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 05, 2022
USD ($)
employee
Apr. 30, 2020
position
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Jan. 31, 2023
USD ($)
Restructuring Cost and Reserve [Line Items]            
Restructuring-related impairment         $ 11,800  
Gain on termination of lease       $ 0 4,471  
Restructuring and related charges            
Restructuring Cost and Reserve [Line Items]            
Restructuring-related impairment     $ 1,769   2,900  
600 West Chicago            
Restructuring Cost and Reserve [Line Items]            
Gain on termination of lease     $ 4,500   $ 4,500  
Option to lease early termination penalty           $ 9,600
2022 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Reduction in number of positions (in employees) | employee 1,150          
Restructuring and related charges, incurred to date       20,500    
2022 Restructuring Plan | Minimum            
Restructuring Cost and Reserve [Line Items]            
Expected restructuring cost (up to) $ 23,600          
2022 Restructuring Plan | Maximum            
Restructuring Cost and Reserve [Line Items]            
Expected restructuring cost (up to) $ 30,600          
2020 Restructuring Plan            
Restructuring Cost and Reserve [Line Items]            
Reduction in number of positions (in employees) | position   1,600        
Restructuring and related charges, incurred to date       $ 108,900