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Business Acquisitions (Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 02, 2018
Jul. 03, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]          
Goodwill     $ 64,489 $ 52,990 $ 0
Net cash consideration     $ 5,794 $ 80,234 $ 0
Archway          
Business Acquisition [Line Items]          
Cash   $ 1,401      
Goodwill   52,990      
Current assets, net   2,539      
Property and equipment   776      
Contingent consideration   (4,800)      
Net cash consideration   80,234      
Total purchase price allocation   81,635      
Archway | Acquired technology          
Business Acquisition [Line Items]          
Identifiable intangible assets   $ 13,510      
Weighted average useful life of acquired intangible assets   10 years      
Archway | Client relationships          
Business Acquisition [Line Items]          
Identifiable intangible assets   $ 10,760      
Weighted average useful life of acquired intangible assets   15 years      
Archway | Non-competition agreements          
Business Acquisition [Line Items]          
Identifiable intangible assets   $ 3,470      
Weighted average useful life of acquired intangible assets   5 years      
Archway | Trade names          
Business Acquisition [Line Items]          
Identifiable intangible assets   $ 2,390      
Weighted average useful life of acquired intangible assets   7 years      
Huntington Steele, LLC          
Business Acquisition [Line Items]          
Cash $ 125        
Goodwill 11,499        
Other assets 15        
Current liabilities (230)        
Contingent consideration (12,120)        
Net cash consideration 5,794        
Huntington Steele, LLC | Client relationships          
Business Acquisition [Line Items]          
Identifiable intangible assets $ 6,180        
Weighted average useful life of acquired intangible assets 12 years        
Huntington Steele, LLC | Trade names          
Business Acquisition [Line Items]          
Identifiable intangible assets $ 450        
Weighted average useful life of acquired intangible assets 7 years