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Acquisitions Pro Forma Table (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
As Reported    
Business Acquisition [Line Items]    
Total revenue $ 704,602 $ 712,877
Net income $ 60,710 $ 85,166
Net income per basic share $ 2.16 $ 2.97
Net income per diluted share $ 2.14 $ 2.93
Pro Forma    
Business Acquisition [Line Items]    
Total revenue $ 732,097 $ 751,873
Net income $ 62,692 $ 88,647
Net income per basic share $ 2.23 $ 3.09
Net income per diluted share $ 2.21 $ 3.05