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Acquisitions (Narrative) (Details)
$ in Thousands, £ in Millions
3 Months Ended 6 Months Ended
May 01, 2017
USD ($)
Apr. 06, 2017
GBP (£)
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jul. 01, 2016
USD ($)
Business Acquisition [Line Items]          
Purchase consideration       $ 9,268  
Non-cash stock compensation expense       4,817 $ 4,224
Jibe Consulting, Inc [Member]          
Business Acquisition [Line Items]          
Effective date of acquisition May 01, 2017        
Purchase consideration $ 5,400        
Purchase consideration, common stock $ 3,600        
Vesting period 4 years        
Contingent consideration $ 11,000        
Contingent consideration performance period 18 months        
Non-cash stock compensation expense       300  
Preliminary purchase price allocation evaluation period from acquisition date 12 months        
Contributed total revenue     $ 2,800    
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes     200    
Acquisition related costs     200    
Jibe Consulting, Inc [Member] | Minimum          
Business Acquisition [Line Items]          
Amortization period 2 years        
Jibe Consulting, Inc [Member] | Maximum          
Business Acquisition [Line Items]          
Amortization period 5 years        
Jibe Consulting, Inc [Member] | Cash Contingent Consideration [Member]          
Business Acquisition [Line Items]          
Contingent consideration $ 6,600        
Jibe Consulting, Inc [Member] | Stock Based Contingent Consideration [Member]          
Business Acquisition [Line Items]          
Contingent consideration $ 4,400        
Aecus Limited [Member]          
Business Acquisition [Line Items]          
Effective date of acquisition   Apr. 06, 2017      
Purchase consideration | £   £ 3.2      
Contingent consideration performance period   12 months      
Non-cash stock compensation expense       400  
Preliminary purchase price allocation evaluation period from acquisition date   12 months      
Contributed total revenue     1,300    
Contribution before depreciation, amortization, interest, corporate overhead allocation and taxes     $ 200    
Acquisition related costs       $ 100  
Acquired percentage   100.00%      
Aecus Limited [Member] | Minimum          
Business Acquisition [Line Items]          
Amortization period   2 years      
Aecus Limited [Member] | Maximum          
Business Acquisition [Line Items]          
Amortization period   5 years      
Aecus Limited [Member] | Cash Contingent Consideration [Member] | Sellers [Member]          
Business Acquisition [Line Items]          
Contingent consideration | £   £ 2.4      
Aecus Limited [Member] | Cash Contingent Consideration [Member] | Key Personnel [Member]          
Business Acquisition [Line Items]          
Contingent consideration | £   0.3      
Aecus Limited [Member] | Stock Based Contingent Consideration [Member] | Key Personnel [Member]          
Business Acquisition [Line Items]          
Contingent consideration | £   £ 0.3