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Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 19, 2019
Apr. 01, 2015
Jun. 30, 2019
Jun. 30, 2018
Stockholders Equity Note [Line Items]        
Dividends declared and paid per share (usd per share) $ 0.05   $ 0.1 $ 0.1
Dividend equivalents paid     $ 600 $ 600
Purchase of treasury stock     $ 29,780 $ 119,401
Cogent Partners, LP        
Stockholders Equity Note [Line Items]        
Business acquisition, equity interest issued or issuable (in shares)   779,454    
Conditional consideration (shares)   334,048    
Additional paid-in capital | Cogent Partners, LP        
Stockholders Equity Note [Line Items]        
Contingent consideration classified as equity   $ 11,900    
Restricted Stock Units        
Stockholders Equity Note [Line Items]        
Restricted stock units vested and issued as common stock (shares)     1,275,051 1,065,587
Repurchased shares for award (shares)     519,017 397,580
Average repurchase price of shares for award (usd per share)     $ 25.27 $ 18.99
Treasury stock, value, acquired, cost method     $ 13,100 $ 7,500
Common stock, par value $0.01 per share        
Stockholders Equity Note [Line Items]        
Treasury stock, shares, acquired (shares)     737,190 4,886,382
Treasury stock acquired, average cost per share (usd per share)     $ 22.60 $ 22.87
Purchase of treasury stock     $ 16,700 $ 111,800