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Acquisitions - Schedule of Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Business Acquisition        
Revenues $ 85,340 $ 67,704 $ 167,736 $ 135,211
Pro forma revenue     168,863  
Net income $ 5,275 $ 9,590 5,473 $ 20,979
Pro forma net income     $ 5,550  
Diluted earnings per share (in usd per share) $ 0.25 $ 0.46 $ 0.26 $ 1.09
Pro forma diluted earnings per share (in usd per share)     $ 0.26  
Series of Individually Immaterial Business Acquisitions        
Business Acquisition        
Revenues     $ 1,127  
Net income     $ 77  
Diluted earnings per share (in usd per share)     $ 0.00