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ACQUISITIONS - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Jun. 01, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
office_building
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]              
Cash paid for business acquisition           $ 157,291 $ 79,525
Contingent consideration, current       $ 57,941 $ 57,941 57,941  
Contingent consideration, noncurrent       32,697 32,697 32,697  
United Kingdom Office Space Asset Acquisition              
Business Acquisition [Line Items]              
Number of office buildings acquired | office_building     2        
Cash consideration     $ 72,908        
Nordeus Limited              
Business Acquisition [Line Items]              
Percentage of noncontrolling interest 5.50%            
Nordeus Limited              
Business Acquisition [Line Items]              
Business acquisition, percentage of voting interests acquired 94.50%            
Cash paid for business acquisition $ 120,488            
Business combination, contingent consideration arrangements, range of outcomes, value, high $ 153,000            
Call option   $ 12,375          
Consideration         289,774    
Contingent earn-out         $ 61,055    
Contingent consideration liability, increase       10,000   30,000  
Transaction costs       $ 34   $ 4,986  
Nordeus Limited | Performance Period One              
Business Acquisition [Line Items]              
Performance period 12 months            
Nordeus Limited | Performance Period Two              
Business Acquisition [Line Items]              
Performance period 24 months