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Acquisitions Acquisition Pro Forma Table (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Scenario, Actual [Member]    
Business Acquisition [Line Items]    
Business Acquisitions, Pro Forma Revenue From Continuing Operations $ 183,203 $ 176,023
Business Acquisition, Pro Forma Net Income (Loss) $ 13,174 $ 16,788
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 0.47 $ 0.59
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 0.47 $ 0.59
Pro Forma [Member]    
Business Acquisition [Line Items]    
Business Acquisitions, Pro Forma Revenue From Continuing Operations $ 184,484 $ 189,436
Business Acquisition, Pro Forma Net Income (Loss) $ 13,221 $ 17,057
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 0.47 $ 0.60
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 0.47 $ 0.60