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Business Combination (Narrative) (Details)
€ in Thousands
1 Months Ended 3 Months Ended
Feb. 19, 2016
EUR (€)
Feb. 19, 2016
USD ($)
Nov. 04, 2015
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2016
EUR (€)
Mar. 31, 2016
USD ($)
Feb. 19, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]                    
Goodwill               $ 111,569,000   $ 91,234,000
Net income         $ 29,406,000 $ 23,777,000        
Revenues         131,945,000 $ 115,618,000        
Mascus International Holdings BV [Member]                    
Business Acquisition [Line Items]                    
Cash consideration € 26,569 $ 29,597,000                
Voting equity interests acquired, percentage 100.00%               100.00%  
Contingent consideration € 3,080               $ 3,432,000  
Goodwill                 $ 19,321,000  
Revenue of since acquisition date       $ 1,268,000            
Legal and other acquisition-related costs               717,500    
Obligation to pay additional amount             € 1,625 1,849,000    
Xcira LLC [Member]                    
Business Acquisition [Line Items]                    
Cash consideration     $ 12,359,000              
Voting equity interests acquired, percentage     75.00%              
Percentage ownership by non-controlling interest holders     25.00%              
Contingent consideration     $ 0              
Goodwill     10,659,000              
Fair value of the non-controlling interest     $ 4,119,000              
Net income         469,000          
Revenues         $ 1,251,000          
Xcira LLC [Member] | Xcira Founder [Member]                    
Business Acquisition [Line Items]                    
Obligation to pay additional amount               2,000,000    
Period to make additional amount of obligation upon achievement of certain condition         3 years          
Future Software Development [Member] | Xcira LLC [Member]                    
Business Acquisition [Line Items]                    
Obligation to pay additional amount               $ 2,700,000    
Period to make additional amount of obligation upon achievement of certain condition         2 years