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 9 Months Ended
Sep. 30, 2018
Jul. 31, 2018
Jun. 30, 2018
Apr. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]                
Contingent cash obligation/payment $ 7,000       $ 7,000   $ 414 $ 541
Goodwill 1,009,462       1,009,462   $ 751,052  
Acquisition of businesses, net of cash and restricted cash acquired         230,474 $ 347,550    
Value of common stock issued         21,816 $ 0    
LeaseLabs                
Business Acquisition [Line Items]                
Total purchase price         112,688      
Contingent cash obligation/payment $ 10,000       10,000      
Length of time for acquisition contingent cash payment to be made 6 months              
Contingent consideration $ 7,000       7,000      
Issuance of common stock at closing in connection with our acquisitions (in shares) 86,745              
Common stock issued at closing         5,300      
Goodwill $ 84,127       84,127      
Gross contractual amount of acquired receivables 3,100       3,100      
Estimated uncollectable amount of acquired receivables 500       500      
Acquisition costs 300              
Deferred cash obligations, net 15,888       15,888      
Noncontrolling interest financing         0      
BluTrend                
Business Acquisition [Line Items]                
Total purchase price 112,700 $ 8,500     8,500      
Contingent consideration 0       0      
Common stock issued at closing         0      
Deferred obligation related to acquisition   2,000            
Goodwill 3,887 3,900     3,887      
Acquisition costs   $ 100            
Deferred obligation recognition period   2 years            
Deferred cash obligations, net 0       0      
Noncontrolling interest financing         0      
ClickPay                
Business Acquisition [Line Items]                
Total purchase price       $ 221,000 221,011      
Contingent consideration 0       0      
Issuance of common stock at closing in connection with our acquisitions (in shares)       870,168        
Common stock issued at closing         48,034      
Deferred obligation related to acquisition       $ 10,200        
Stock issued for acquisition       24,700        
Goodwill 172,618       172,618      
Gross contractual amount of acquired receivables       2,800        
Estimated uncollectable amount of acquired receivables       500        
Acquisition costs       1,600        
Acquisition of businesses, net of cash and restricted cash acquired       138,800        
Cash acquired       7,500        
Deferred cash obligations, net 9,821     9,800 9,821      
Noncontrolling interest financing       $ 24,400 24,369      
Stock issued for acquisitions and held in escrow (in shares)       187,480        
NovelPay                
Business Acquisition [Line Items]                
Goodwill 105,000       $ 105,000      
Percentage of holders retaining membership rights       12.00%        
Shares issued to NovelPay membership holder (in shares)     395,206          
Value of common stock issued     $ 21,800          
Payments for repurchase of NovelPay membership units 2,900              
Common Stock | LeaseLabs                
Business Acquisition [Line Items]                
Common stock issued at closing 5,300              
Deferred obligation related to acquisition 5,000              
Stock issued for acquisition $ 4,800              
Common Stock | ClickPay                
Business Acquisition [Line Items]                
Common stock issued at closing       $ 48,000        
Developed product technologies | LeaseLabs                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets 7 years              
Developed product technologies | BluTrend                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets   5 years            
Developed product technologies | ClickPay                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets       7 years        
Client relationships | LeaseLabs                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets 10 years              
Client relationships | BluTrend                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets   10 years            
Client relationships | ClickPay                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets       10 years        
Trade names | LeaseLabs                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets 10 years              
Trade names | BluTrend                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets   2 years            
Trade names | ClickPay                
Business Acquisition [Line Items]                
Amortized useful life of acquired intangible assets       10 years        
Maximum | BluTrend                
Business Acquisition [Line Items]                
Total deferred cash obligation   $ 1,000            
Deferred stock obligation   $ 1,000