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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]        
Amortization of intangible assets   $ 14,700,000 $ 10,500,000 $ 11,900,000
Goodwill accumulated impairment loss $ 0 0 0 $ 0
Merchant portfolios        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets acquired   $ 90,900,000 $ 2,500,000  
Direct Connect Merchant Services, LLC | Merchant portfolios        
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets acquired $ 44,800,000