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Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Mar. 31, 2016
Business Acquisition [Line Items]      
Business Acquisition, Pro Forma Revenue $ 149,013 $ 162,558  
Goodwill 170,003   $ 170,716
Business Acquisition, Pro Forma Net Income (Loss) $ 6,401 $ 7,582  
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 0.32 $ 0.38  
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 0.32 $ 0.37  
Stahlhammer Bommern GmbH [Member]      
Business Acquisition [Line Items]      
Goodwill $ 0