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Acquisitions - Pro Forma Financial Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]    
Actual revenue $ 230,612  
Actual net income 12,914  
Pro forma revenue 2,648,242 $ 2,512,807
Pro forma net income 217,906 $ 223,135
Pro Forma    
Business Acquisition [Line Items]    
Acquisition related costs $ 1,400