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Acquisitions Acquisition (Details 2) - Sotawall
$ in Thousands
Dec. 14, 2016
USD ($)
Business Acquisition [Line Items]  
Total other intangible assets $ 91,813
Technology  
Business Acquisition [Line Items]  
Finite lived intangibles $ 6,319
Estimated useful life (in years) 10 years
Backlog  
Business Acquisition [Line Items]  
Finite lived intangibles $ 12,638
Estimated useful life (in years) 1 year 6 months
Customer relationships  
Business Acquisition [Line Items]  
Finite lived intangibles $ 60,523
Estimated useful life (in years) 17 years
Tradename  
Business Acquisition [Line Items]  
Indefinite lived intangibles $ 12,333