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Acquisitions (Narrative) (Details)
€ in Millions, ZAR in Millions, $ in Millions
1 Months Ended 6 Months Ended
Nov. 01, 2016
USD ($)
Oct. 01, 2016
USD ($)
Nov. 30, 2016
EUR (€)
Nov. 30, 2016
USD ($)
Oct. 31, 2016
ZAR
Oct. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
C4U Malta [Member]              
Business Acquisition [Line Items]              
Business acquisition date             Nov. 30, 2016
Percentage acquired in acquisition     100.00% 100.00%      
Business acquisition, cost of acquired entity     € 3.6 $ 3.9      
Business acquisition, acquisition-related expenditure             $ 0.2
Business acquisition, contributed revenue $ 0.1            
Business acquisition, contributed net loss $ 0.2            
Pros Software [Member]              
Business Acquisition [Line Items]              
Business acquisition date             Oct. 31, 2016
Percentage acquired in acquisition         100.00% 100.00%  
Business acquisition, cost of acquired entity         ZAR 25.0 $ 1.8  
Business acquisition, contributed revenue   $ 0.2          
Business acquisition, contributed net loss   $ 0.6