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Acquisitions (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jul. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]            
Cash paid for business acquisitions, net of cash acquired       $ 32,161 $ 143,768 $ 83,804
Liability for contingent consideration, current and non-current       $ 77,925 $ 108,233  
Weighted average amortization period       9 years 10 years 10 years
RPM, Canpango and Intelisys Global [Member]            
Business Acquisition [Line Items]            
Cash paid for business acquisitions, net of cash acquired   $ 32,200        
Acquisition-related costs       $ 900    
POS Portal [Member]            
Business Acquisition [Line Items]            
Cash paid for business acquisitions, net of cash acquired $ 143,768   $ 143,800      
Acquisition-related costs       200    
Initial purchase price     144,900      
Additional customary closing costs paid     3,400      
Cash acquired in acquisition     4,600      
Liability for contingent consideration, current and non-current $ 13,098          
Escrow deposits received from seller       $ 200    
Weighted average amortization period       10 years    
Maximum [Member] | POS Portal [Member]            
Business Acquisition [Line Items]            
Liability for contingent consideration, current and non-current     $ 13,200