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Business Acquisitions (Narrative) (Details)
3 Months Ended
Aug. 06, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]        
Goodwill     $ 80,721,000 $ 80,721,000
Meural        
Business Acquisition [Line Items]        
Total purchase price $ 22,200,000      
Purchase price, cash paid   $ 14,400,000    
Prior equity interest settlement 1,500,000      
Fair value of contingent consideration 6,300,000   $ 5,900,000  
Goodwill 16,407,000      
Goodwill deductible for income tax purposes 0      
Non-current deferred income taxes 815,000      
Intangibles 4,800,000      
Meural | Technology        
Business Acquisition [Line Items]        
Intangibles $ 3,000,000.0      
Acquired intangible assets, estimated useful life ( in years) 7 years      
Meural | Trade Names        
Business Acquisition [Line Items]        
Intangibles $ 600,000      
Acquired intangible assets, estimated useful life ( in years) 3 years      
Meural | Customer Relationships        
Business Acquisition [Line Items]        
Intangibles $ 600,000      
Acquired intangible assets, estimated useful life ( in years) 2 years      
Meural | Database        
Business Acquisition [Line Items]        
Intangibles $ 600,000      
Acquired intangible assets, estimated useful life ( in years) 7 years      
Technical Milestone | Meural        
Business Acquisition [Line Items]        
Contingent consideration liability, maximum amount of each milestone $ 3,500,000      
Service Revenue Milestone | Meural        
Business Acquisition [Line Items]        
Contingent consideration liability, maximum amount of each milestone $ 3,500,000      
Measurement Input, Discount Rate | Minimum | Meural        
Business Acquisition [Line Items]        
Intangible Asset, Measurement Input 0.160      
Measurement Input, Discount Rate | Maximum | Meural        
Business Acquisition [Line Items]        
Intangible Asset, Measurement Input 0.190