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Business Combinations (Narrative) (Details) - USD ($)
$ in Thousands
Mar. 01, 2017
May 31, 2017
Nov. 30, 2016
Business Acquisition [Line Items]      
Goodwill   $ 290,698 $ 278,067
DataRPM Corporation [Member]      
Business Acquisition [Line Items]      
Percentage of voting interests acquired 100.00%    
Total purchase consideration $ 30,000    
Goodwill 12,601    
Restricted Stock Units [Member] | DataRPM Corporation [Member]      
Business Acquisition [Line Items]      
Consideration payable in form of restricted stock units $ 1,700    
Award vesting period 2 years