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Acquisition - Schedule of Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition        
Revenues $ 89,806 $ 68,847 $ 257,542 $ 204,058
Pro forma revenue     258,669  
Net income $ 8,083 $ 8,640 13,556 $ 29,619
Pro forma net income     $ 13,633  
Diluted earnings per share (in usd per share) $ 0.38 $ 0.41 $ 0.63 $ 1.50
Pro forma diluted earnings per share (in usd per share)     $ 640  
Series of Individually Immaterial Business Acquisitions        
Business Acquisition        
Revenues     $ 1,127  
Net income     $ 77  
Diluted earnings per share (in usd per share)     $ 0