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Acquisitions Pro Forma Table (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]    
Total revenue $ 1,088,377 $ 704,602
Net income $ 60,127 $ 60,710
Net income per basic share $ 1.72 $ 2.16
Net income per diluted share $ 1.72 $ 2.14
Transaction $ 68,800  
Pro Forma    
Business Acquisition [Line Items]    
Total revenue 1,771,835 $ 1,792,523
Net income $ 118,333 $ 61,479
Net income per basic share $ 2.44 $ 1.27
Net income per diluted share $ 2.44 $ 1.27