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Acquisitions (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2016
Jun. 30, 2018
Business Acquisition [Line Items]          
Consideration transferred, net of cash acquired   $ 13,207 $ 142,802    
Liability for contingent consideration, current and non-current portion   80,173     $ 108,233
Canpango [Member]          
Business Acquisition [Line Items]          
Consideration transferred, net of cash acquired   13,200      
POS Portal [Member]          
Business Acquisition [Line Items]          
Consideration transferred, net of cash acquired $ 143,768        
Consideration transferred, initial purchase price 144,900        
Customary closing adjustments paid       $ 3,400  
Cash acquired 4,600        
Liability for contingent consideration, current and non-current portion 13,098        
Purchase price in escrow   $ 13,100      
Weighted average useful life   10 years      
Maximum [Member] | POS Portal [Member]          
Business Acquisition [Line Items]          
Liability for contingent consideration, current and non-current portion $ 13,200