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GOODWILL (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 12, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Jun. 24, 2020
Oct. 22, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                  
Goodwill   $ 2,009,117,000   $ 2,009,117,000   $ 1,882,020,000     $ 1,611,535,000
Goodwill acquired       135,878,000   267,804,000      
Goodwill, impairment loss   $ 0 $ 0 $ 0 $ 0        
STR Inc and STR Global Ltd [Member]                  
Business Acquisition [Line Items]                  
Goodwill               $ 261,868,000  
Off Campus Partners [Member]                  
Business Acquisition [Line Items]                  
Goodwill acquired $ 8,000,000                
Cozy Services Ltd [Member]                  
Business Acquisition [Line Items]                  
Goodwill           $ 53,000,000      
Ten-X [Member]                  
Business Acquisition [Line Items]                  
Goodwill             $ 135,446,000