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Acquisitions (Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Nov. 15, 2016
Nov. 08, 2016
Sep. 20, 2016
May 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]              
Goodwill $ 287,956 $ 275,487         $ 264,416
Houston, Texas And Madera, California [Member]              
Business Acquisition [Line Items]              
Current assets   530          
Property, plant & equipment   15,972          
Goodwill   11,832          
Intangible and other non-current assets   4,588          
Assumed liabilities   (167)          
Purchase Price   $ 32,755          
Houston, Texas [Member]              
Business Acquisition [Line Items]              
Assets Acquired (Excluding Goodwill)           $ 7,000  
Goodwill           3,300  
Assumed liabilities           $ (100)  
Madera, California [Member]              
Business Acquisition [Line Items]              
Assets Acquired (Excluding Goodwill)         $ 3,700    
Goodwill         1,900    
Assumed liabilities         $ 0    
Brooksfield, Wisconsin [Member]              
Business Acquisition [Line Items]              
Assets Acquired (Excluding Goodwill)       $ 5,700      
Goodwill       1,200      
Assumed liabilities       $ (100)      
Colorado And New York [Member]              
Business Acquisition [Line Items]              
Current assets 180            
Property, plant & equipment 12,195            
Goodwill 12,469            
Intangible and other non-current assets 3,309            
Assumed liabilities (63)            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation (590)            
Purchase Price $ 27,500            
Burlington/Graham, North Carolina [Member]              
Business Acquisition [Line Items]              
Assets Acquired (Excluding Goodwill)     $ 4,700        
Goodwill     5,400        
Assumed liabilities     $ 0