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Acquisitions (Purchase Price Allocation) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 08, 2016
Sep. 20, 2016
May 31, 2016
Business Acquisition [Line Items]            
Goodwill $ 303,887 $ 287,956 $ 275,487      
Houston, Texas And Madera, California [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 Obligations   (590)        
Purchase price   $ 27,500        
Houston, Texas [Member]            
Business Acquisition [Line Items]            
Assets Acquired (Excluding Goodwill)           $ 1,500
Goodwill           700
Assumed liabilities           $ 0
Madera, California [Member]            
Business Acquisition [Line Items]            
Assets Acquired (Excluding Goodwill)         $ 1,700  
Goodwill         700  
Assumed liabilities         $ (100)  
Brooksfield, Wisconsin [Member]            
Business Acquisition [Line Items]            
Assets Acquired (Excluding Goodwill)       $ 12,500    
Goodwill       11,100    
Assumed liabilities       $ (600)    
Colorado And New York [Member]            
Business Acquisition [Line Items]            
Current assets 166          
Property, plant & equipment 17,543          
Goodwill 16,777          
Intangible and other non-current assets 3,863          
Assumed liabilities (399)          
Purchase price $ 37,950