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GOODWILL (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 12, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Oct. 22, 2019
Dec. 31, 2018
Business Acquisition [Line Items]            
Goodwill   $ 1,873,987,000   $ 1,882,020,000   $ 1,611,535,000
Goodwill acquired   432,000   267,804,000    
Goodwill, impairment loss   $ 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    
Goodwill acquired       $ 1,000,000