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ACQUISITIONS - Business Acquisitions (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Allocation of purchase price:      
Goodwill $ 1,121,153 $ 1,090,231 $ 860,495
Business acquisitions      
ACQUISITIONS      
Number of business acquisitions closed 5    
Consideration:      
Cash due at closing $ 59,510    
Estimated working capital adjustment (174)    
Fair market value of estimated contingent consideration 6,332    
Total consideration 65,668    
Allocation of purchase price:      
Total tangible assets 4,673    
Total liabilities assumed (12,272)    
Goodwill 32,121    
Total allocated consideration 65,668    
Amount of goodwill and intangibles expected to be deductible for tax purposes $ 38,665    
Deductibility period for goodwill and intangible assets acquired in a business acquisition (in years) 15 years    
Number of business acquisitions closed during the period which are new subsidiary partner firms | item 2    
Revenue from acquired entity in business acquisitions $ 3,867    
Income from acquired entity in business acquisitions 886    
Business acquisitions | Customer relationships      
Allocation of purchase price:      
Finite-lived intangible assets 39,749    
Business acquisitions | Management contracts      
Allocation of purchase price:      
Finite-lived intangible assets 1,194    
Business acquisitions | Other intangibles      
Allocation of purchase price:      
Finite-lived intangible assets $ 203