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ACQUISITIONS - Acquisition Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 16, 2020
Dec. 31, 2020
Dec. 31, 2019
Jun. 27, 2019
Disclosure of detailed information about business combination [line items]        
Consideration transferred, acquisition-date fair value       $ 13,000
Income before income taxes   $ 181,321 $ 86,129  
Alacer        
Disclosure of detailed information about business combination [line items]        
Consideration transferred, acquisition-date fair value $ 2,200,000      
Transaction and integration expense 20,800      
Severance and termination payments $ 11,000      
Revenue of combined entity as if combination occurred at beginning of period   1,200,000    
Profit (loss) of combined entity as if combination occurred at beginning of period   208,900    
Alacer | Operating segments        
Disclosure of detailed information about business combination [line items]        
Revenue of acquiree since acquisition date   205,500    
Profit (loss) of acquiree since acquisition date   $ 43,400