Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - 2018 Acquisitions (Details)

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Acquisitions - 2018 Acquisitions (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended
Jun. 30, 2018
Apr. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]          
Acquisition of businesses, net of cash and restricted cash acquired     $ 137,475 $ 123,241  
Value of common stock issued     20,756 $ 0  
Goodwill $ 918,785   $ 918,785   $ 751,052
ClickPay          
Business Acquisition [Line Items]          
Total purchase price   $ 216,900      
Acquisition of businesses, net of cash and restricted cash acquired   138,800      
Cash acquired   $ 7,500      
Issuance of common stock for acquisition of ClickPay (in shares)   682,688      
Deferred cash payment amount related to acquisition   $ 20,000      
Deferred cash obligations, net   18,900      
Stock issued for acquisition   23,600      
Fair value of put and call agreement   $ 23,300      
Percentage of holders retaining membership rights 3.00% 12.00% 3.00%    
Accrued liability to noncontrolling interests $ 2,800        
Shares issued to NovelPay membership holder (in shares) 395,206        
Value of common stock issued $ 20,800        
Goodwill 168,033   $ 168,033    
Gross contractual amount of acquired receivables   $ 2,800      
Estimated uncollectable amount of acquired receivables   100      
Acquisition costs   1,400      
2018 Acquisitions          
Business Acquisition [Line Items]          
Deferred cash obligation 20,000   20,000    
Deferred cash obligation discount $ 900   $ 900    
Common Stock | ClickPay          
Business Acquisition [Line Items]          
Value of common stock issued for ClickPay acquisition   $ 35,900      
Developed product technologies | ClickPay          
Business Acquisition [Line Items]          
Amortized useful life of acquired intangible assets   7 years      
Client relationships | ClickPay          
Business Acquisition [Line Items]          
Amortized useful life of acquired intangible assets   10 years      
Trade names | ClickPay          
Business Acquisition [Line Items]          
Amortized useful life of acquired intangible assets   10 years