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ACQUIRED INTANGIBLE ASSETS - Schedule of Acquired Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]            
Cost $ 360,577 $ 202,326        
Accumulated Amortization (91,885) (64,714)        
Net $ 268,692 $ 137,612 $ 262,196 $ 107,562 $ 99,802 $ 69,079
Technology assets            
Acquired Finite-Lived Intangible Assets [Line Items]            
Weighted Average Estimated Useful Life 5 years 5 years        
Cost $ 165,255 $ 119,508        
Accumulated Amortization (59,085) (43,084)        
Net $ 106,170 $ 76,424        
Customer assets            
Acquired Finite-Lived Intangible Assets [Line Items]            
Weighted Average Estimated Useful Life 15 years 11 years        
Cost $ 128,418 $ 58,556        
Accumulated Amortization (16,805) (10,796)        
Net $ 111,613 $ 47,760        
Trade name            
Acquired Finite-Lived Intangible Assets [Line Items]            
Weighted Average Estimated Useful Life 9 years 6 years        
Cost $ 53,194 $ 18,529        
Accumulated Amortization (12,355) (8,031)        
Net $ 40,839 $ 10,498        
Other            
Acquired Finite-Lived Intangible Assets [Line Items]            
Weighted Average Estimated Useful Life 9 years 8 years        
Cost $ 13,710 $ 5,733        
Accumulated Amortization (3,640) (2,803)        
Net $ 10,070 $ 2,930