Annual report pursuant to Section 13 and 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details)

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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangible assets $ 33,100 $ 32,400 $ 14,700  
Intangible assets, net 98,057 182,826    
Impairment charges for intangible asset 1,753 0 $ 0  
Merchant portfolios        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets acquired 10,000 69,800    
Residual buyouts        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets acquired 3,500 19,900    
Residual buyouts | Consumer Payments        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets, net       $ 2,200
Intangible asset, fair value $ 500      
Technology        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets acquired   1,000    
YapStone, Inc | Merchant portfolios        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets acquired   $ 68,700