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Acquisitions Acquisition (Details 1) - USD ($)
$ in Thousands
Mar. 04, 2017
Dec. 14, 2016
Feb. 27, 2016
Feb. 28, 2015
Business Acquisition [Line Items]        
Goodwill $ 101,334   $ 73,996 $ 75,857
Sotawall        
Business Acquisition [Line Items]        
Net working capital   $ 10,682    
Property, plant and equipment   7,993    
Goodwill   27,444    
Net assets acquired   91,813    
Net assets acquired   $ 137,932