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Acquisitions Acquisition Pro Forma Table (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Scenario, Actual [Member]    
Business Acquisition [Line Items]    
Business Acquisitions, Pro Forma Revenue From Continuing Operations $ 365,182 $ 343,646
Business Acquisition, Pro Forma Net Income (Loss) $ 24,847 $ 30,127
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 0.88 $ 1.06
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 0.88 $ 1.06
Pro Forma [Member]    
Business Acquisition [Line Items]    
Business Acquisitions, Pro Forma Revenue From Continuing Operations $ 366,463 $ 371,300
Business Acquisition, Pro Forma Net Income (Loss) $ 24,894 $ 30,663
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 0.88 $ 1.08
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 0.88 $ 1.08