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Acquisition (Details)
3 Months Ended 6 Months Ended
Apr. 01, 2015
USD ($)
Loan
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2014
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]            
Payments to acquire businesses       $ 45,260,000 $ 0  
Number of Bank Term Loan Facilities | Loan 2          
Term Loan Facilities   $ 33,750,000   33,750,000   $ 0
Contingent obligation due selling unitholders of Cogent   13,144,000   13,144,000   0
Goodwill   216,790,000   216,790,000   $ 130,976,000
Cogent Partners, LP            
Business Acquisition [Line Items]            
Payments to acquire businesses $ 44,000,000          
Number of shares issued during acquisition, shares | shares 779,454          
Maximum contingent consideration $ 18,900,000          
Conditional consideration, shares | shares 334,048          
Number of Bank Term Loan Facilities | Loan 2          
Term Loan Facilities $ 45,000,000.0          
Business Acquisition, Contingent Consideration, Distribution Period Ending On the Second Anniversary 2 years          
Business Acquisition, Contingent Consideration, Distribution Period Ending On the Fourth Anniversary 2 years          
Fair value of contingent issuance of common shares at acquisition date $ 11,900,000          
Contingent obligation due selling unitholders of Cogent 13,100,000          
Professional fees   1,200,000        
Total purchase price 100,000,000          
Goodwill 92,981,000          
Amortization expense   200,000   200,000    
Escrow deposit 8,900,000          
Amount due to sellers are post-closing adjustment   $ 3,000,000   $ 3,000,000    
Goodwill, Estimated Useful Life       15 years    
Ratio of compensation to total revenue, percent   54.00% 54.00% 54.00% 54.00%  
Cogent 12 Month Facility            
Business Acquisition [Line Items]            
Term Loan Facilities   $ 11,300,000   $ 11,300,000    
Cogent 36 Month Facility            
Business Acquisition [Line Items]            
Term Loan Facilities   $ 22,500,000   $ 22,500,000    
Long-term Debt | Cogent 36 Month Facility | Cogent Partners, LP            
Business Acquisition [Line Items]            
Term Loan Facilities 22,500,000.0          
Short-term Debt | Cogent 12 Month Facility | Cogent Partners, LP            
Business Acquisition [Line Items]            
Term Loan Facilities $ 22,500,000.0          
Minimum | Cogent Partners, LP            
Business Acquisition [Line Items]            
Estimated remaining useful life (years)       1 year    
Maximum | Cogent Partners, LP            
Business Acquisition [Line Items]            
Estimated remaining useful life (years)       3 years