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Acquisitions (Narrative) (Details)
$ in Thousands
6 Months Ended
Jul. 31, 2017
USD ($)
Aug. 29, 2016
USD ($)
installment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]          
Consideration transferred, net of cash acquired     $ 143,768 $ 83,804  
Liability for contingent consideration, current and non-current portion     97,031   $ 114,036
POS Portal [Member]          
Business Acquisition [Line Items]          
Consideration transferred, initial purchase price $ 144,900        
Customary closing adjustments paid     3,400    
Cash acquired 4,600        
Consideration transferred, net of cash acquired 143,768        
Liability for contingent consideration, current and non-current portion 13,098        
Purchase price in escrow     $ 13,100    
Weighted average useful life     10 years    
Intelisys [Member]          
Business Acquisition [Line Items]          
Consideration transferred, initial purchase price   $ 83,600      
Cash acquired   800      
Consideration transferred, net of cash acquired   83,804      
Liability for contingent consideration, current and non-current portion   95,000      
Purchase price in escrow     $ 8,500    
Weighted average useful life     10 years    
Consideration transferred, initial cash payment   84,600      
Consideration transferred, additional net assets acquired   $ 1,000      
Additional annual cash installments | installment   4      
Maximum [Member]          
Business Acquisition [Line Items]          
Weighted average useful life     12 years    
Maximum [Member] | POS Portal [Member]          
Business Acquisition [Line Items]          
Liability for contingent consideration, current and non-current portion $ 13,200