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Business Acquisitions (Details) - USD ($)
$ in Thousands
Jan. 30, 2017
Jul. 01, 2017
Dec. 31, 2016
Current assets:      
Goodwill   $ 87,740 $ 74,764
C1 Consulting LLC      
Business Acquisitions      
Maximum earnout period (in years) 4 years    
Current assets:      
Accounts receivable and unbilled receivables $ 3,898    
Other current assets 10    
Total current assets 3,908    
Property and equipment 206    
Other non-current assets 106    
Intangible assets 8,800    
Goodwill 12,240    
Total assets acquired 25,260    
Current liabilities:      
Deferred revenue 3,140    
Accrued expenses and other current liabilities 600    
Total current liabilities 3,740    
Contingent consideration 2,357    
Total liabilities assumed 6,097    
Net assets acquired $ 19,163    
C1 Consulting LLC | Selling, general and administrative expenses      
Current liabilities:      
Transaction related costs   $ 500  
C1 Consulting LLC | Non-competition agreements      
Current liabilities:      
Estimated useful life (in years) 5 years    
C1 Consulting LLC | Customer relationships      
Current liabilities:      
Estimated useful life (in years) 10 years