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Acquisition (Details)
$ in Thousands
12 Months Ended 21 Months Ended
Apr. 01, 2015
USD ($)
Loan
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Business Acquisition [Line Items]            
Payments to acquire Cogent Partners, LP   $ 0 $ 45,265 $ 0    
Bank term loans payable   16,875 33,750   $ 16,875  
Revenue target for the Earnout $ 80,000          
Contingent obligation due selling unitholders of Cogent   15,095 13,647   15,095  
Increase in fair value of contingent obligation   1,448 503 0    
Goodwill   208,186 209,024 $ 130,976 208,186  
Cogent 36 Month Facility            
Business Acquisition [Line Items]            
Bank term loans payable   16,900     16,900  
Cogent Partners, LP            
Business Acquisition [Line Items]            
Ownership percent acquired 100.00%          
Payments to acquire Cogent Partners, LP $ 44,000          
Common stock paid at acquisition closing (shares) | shares 779,454          
Contingent consideration, cash $ 18,900          
Possible contingent consideration (shares) | shares 334,048          
Number of bank term loan facilities (loan) | Loan 2          
Bank term loans payable $ 45,000          
Distribution period ending on the second anniversary of the closing 2 years          
Distribution period ending on the fourth anniversary of the closing 2 years          
Fair value of contingent common shares $ 11,900          
Contingent obligation due selling unitholders of Cogent 13,100          
Increase in fair value of contingent obligation   1,500 500   $ 2,000  
Transaction costs   1,200        
Purchase price 100,000          
Goodwill 93,116          
Amortization expense   500 500      
Escrow deposit 8,900          
Amount to trigger post-closing distribution payment           $ 5,000
Post closing distribution   8,400 $ 7,900      
Portion of escrow returned to company   $ 500        
Goodwill useful life (years)   15 years        
Ratio of compensation to total revenue (percent)   54.00% 54.00% 54.00%    
Cogent Partners, LP | Minimum            
Business Acquisition [Line Items]            
Intangible assets useful life (years)   1 year        
Cogent Partners, LP | Maximum            
Business Acquisition [Line Items]            
Intangible assets useful life (years)   3 years        
Cogent Partners, LP | Long-term Debt | Cogent 36 Month Facility            
Business Acquisition [Line Items]            
Bank term loans payable 22,500          
Cogent Partners, LP | Short-term Debt | Cogent 12 Month Facility            
Business Acquisition [Line Items]            
Bank term loans payable $ 22,500