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Acquisitions Acquisition (Details 1) - USD ($)
$ in Thousands
Jun. 03, 2017
Mar. 04, 2017
Dec. 14, 2016
Feb. 27, 2016
Business Acquisition [Line Items]        
Goodwill $ 95,211 $ 101,334   $ 73,996
Sotawall        
Business Acquisition [Line Items]        
Net working capital     $ 10,682  
Property, plant and equipment     7,993  
Goodwill     21,380  
Other intangible assets     94,630  
Net assets acquired     $ 134,685