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Acquisitions (Narrative) (Details)
$ in Thousands
3 Months Ended
Nov. 16, 2018
USD ($)
Jul. 02, 2018
USD ($)
Apr. 04, 2017
USD ($)
Mar. 31, 2018
USD ($)
business
Jul. 01, 2017
USD ($)
business
Apr. 01, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]                  
Preliminary goodwill allocation             $ 2,520,966 $ 2,471,459 $ 2,274,426
Eliane S/A Revestimentos Ceramicos                  
Business Acquisition [Line Items]                  
Acquired indebtedness $ 99,037                
Purchase agreement price 148,741                
Cash held in escrow 5,285                
Preliminary goodwill allocation 19,821                
Intangible assets subject to amortization 3,726                
Godfrey Hirst Group                  
Business Acquisition [Line Items]                  
Purchase agreement price   $ 400,894              
Preliminary goodwill allocation   87,043              
Intangible assets subject to amortization   43,635              
Emilceramica S.r.l                  
Business Acquisition [Line Items]                  
Purchase agreement price     $ 186,099            
Preliminary goodwill allocation     59,491            
Intangible assets subject to amortization     2,348            
Tradenames | Eliane S/A Revestimentos Ceramicos                  
Business Acquisition [Line Items]                  
Indefinite-lived tradename intangible asset $ 33,111                
Tradenames | Godfrey Hirst Group                  
Business Acquisition [Line Items]                  
Indefinite-lived tradename intangible asset   $ 58,671              
Tradenames | Emilceramica S.r.l                  
Business Acquisition [Line Items]                  
Indefinite-lived tradename intangible asset     $ 16,196            
Flooring ROW                  
Business Acquisition [Line Items]                  
Purchase agreement price       $ 24,610          
Preliminary goodwill allocation       12,874          
Intangible assets subject to amortization       $ 7          
Number of acquisitions | business       3          
Flooring ROW | Flooring ROW Acquisition                  
Business Acquisition [Line Items]                  
Purchase agreement price           $ 1,407      
Intangible assets subject to amortization           $ 827      
Global Ceramic | Global Ceramic Acquisitions                  
Business Acquisition [Line Items]                  
Purchase agreement price         $ 37,250        
Preliminary goodwill allocation         $ 1,002        
Number of acquisitions | business         2        
Flooring NA | Flooring NA Acquisition                  
Business Acquisition [Line Items]                  
Purchase agreement price         $ 26,623