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ACQUISITIONS - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Jun. 01, 2021
USD ($)
Jun. 30, 2021
USD ($)
office_building
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Business Acquisition [Line Items]        
Cash paid for business acquisition     $ 97,887 $ 0
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      
Total 306,306      
Contingent earn-out $ 78,664      
Contingent consideration, current   28,294 28,294  
Contingent consideration, noncurrent   $ 50,370 50,370  
Transaction costs     $ 2,003  
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