Annual report pursuant to Section 13 and 15(d)

ASSET ACQUISITIONS, ASSET CONTRIBUTIONS, AND BUSINESS COMBINATIONS - Asset Acquisitions Narrative (Details)

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ASSET ACQUISITIONS, ASSET CONTRIBUTIONS, AND BUSINESS COMBINATIONS - Asset Acquisitions Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 15, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                
Non-controlling interest           $ 0 $ 5,654,000  
Borrowings under revolving line of credit           7,000,000 14,000,000 $ 8,000,000
Accruals for asset acquisition contingent consideration       $ 0   8,332,000 2,133,000 $ 0
Priority Real Estate Technology LLC (PRET)                
Business Acquisition [Line Items]                
Gain on sale attributable to noncontrolling interest         $ 45,100,000      
YapStone, Inc                
Business Acquisition [Line Items]                
Payments for asset acquisitions     $ 65,000,000.0          
Non-controlling interest     5,700,000          
Asset acquisition, software license agreement     1,000,000.0          
Asset acquisition, service agreement     $ 1,200,000          
Residual Portfolio Rights Acquired                
Business Acquisition [Line Items]                
Asset acquisition, intangible assets $ 15,200,000              
Asset acquisition, contingent consideration $ 6,400,000              
Asset acquisition, contingent consideration, period 3 years              
Payment for contingent consideration   $ 2,100,000            
Contingent consideration liability, current           $ 2,100,000    
Direct Connect Merchant Services, LLC                
Business Acquisition [Line Items]                
Payments for asset acquisitions       $ 44,800,000        
Asset acquisition, contingent consideration             7,300,000  
Accruals for asset acquisition contingent consideration             $ 0  
Term Loan | Line of Credit | Syndicate of Lenders | Residual Portfolio Rights Acquired                
Business Acquisition [Line Items]                
Borrowings under revolving line of credit $ 5,000,000.0              
Revolving Credit Facility | Residual Portfolio Rights Acquired                
Business Acquisition [Line Items]                
Borrowings under revolving line of credit $ 10,000,000.0