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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 |  |  |  |

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