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Segment Reporting (Summary of segment information) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 01, 2016 USD ($) | Jul. 02, 2016 USD ($) | Apr. 02, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reporting segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Net sales | $ 2,369,097 | $ 2,448,510 | $ 2,453,038 | $ 2,220,645 | $ 2,182,566 | $ 2,294,139 | $ 2,310,336 | $ 2,172,046 | $ 9,491,290 | $ 8,959,087 | $ 8,071,563
Operating income (loss) |  |  |  |  |  |  |  |  | 1,354,173 | 1,279,943 | 837,566
Depreciation and amortization |  |  |  |  |  |  |  |  | 446,672 | 409,467 | 362,647
Capital expenditures (excluding acquisitions) |  |  |  |  |  |  |  |  | 905,998 | 672,125 | 503,657
Assets | 12,094,853 |  |  |  | 10,230,596 |  |  |  | 12,094,853 | 10,230,596 | 9,934,400
Long-lived assets | 6,742,249 |  |  |  | 5,644,774 |  |  |  | 6,742,249 | 5,644,774 | 5,440,483
Soft surface |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,655,525 | 3,414,956 | 3,056,946
Tile |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,485,245 | 3,258,136 | 3,094,389
Laminate and wood |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,350,520 | 2,285,995 | 1,920,228
United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 6,009,165 | 5,842,683 | 5,399,561
Long-lived assets | 3,339,363 |  |  |  | 3,092,902 |  |  |  | 3,339,363 | 3,092,902 | 2,945,783
Belgium |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 1,705,947 |  |  |  | 1,371,397 |  |  |  | 1,705,947 | 1,371,397 | 1,377,533
All other countries |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,482,125 | 3,116,404 | 2,672,002
Long-lived assets | 1,696,939 |  |  |  | 1,180,475 |  |  |  | 1,696,939 | 1,180,475 | 1,117,167
Operating segments | Global Ceramic |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,405,100 | 3,174,706 | 3,012,859
Operating income (loss) |  |  |  |  |  |  |  |  | 525,401 | 478,448 | 414,154
Depreciation and amortization |  |  |  |  |  |  |  |  | 161,913 | 135,370 | 118,801
Capital expenditures (excluding acquisitions) |  |  |  |  |  |  |  |  | 310,650 | 263,401 | 247,829
Assets | 4,838,310 |  |  |  | 4,024,859 |  |  |  | 4,838,310 | 4,024,859 | 3,846,133
Operating segments | Flooring NA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 4,010,858 | 3,865,746 | 3,602,112
Operating income (loss) |  |  |  |  |  |  |  |  | 540,337 | 505,115 | 264,271
Depreciation and amortization |  |  |  |  |  |  |  |  | 159,980 | 148,067 | 137,064
Capital expenditures (excluding acquisitions) |  |  |  |  |  |  |  |  | 355,941 | 248,843 | 148,598
Assets | 3,702,137 |  |  |  | 3,410,856 |  |  |  | 3,702,137 | 3,410,856 | 3,164,525
Operating segments | Flooring ROW |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,075,452 | 1,918,635 | 1,456,898
Operating income (loss) |  |  |  |  |  |  |  |  | 329,054 | 333,091 | 203,370
Depreciation and amortization |  |  |  |  |  |  |  |  | 114,794 | 116,048 | 97,239
Capital expenditures (excluding acquisitions) |  |  |  |  |  |  |  |  | 221,763 | 144,207 | 95,447
Assets | 3,245,424 |  |  |  | 2,689,592 |  |  |  | 3,245,424 | 2,689,592 | 2,805,246
Corporate and intersegment eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (40,619) | (36,711) | (44,229)
Assets | $ 308,982 |  |  |  | $ 105,289 |  |  |  | 308,982 | 105,289 | 118,496
Intersegment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (120) | 0 | (306)
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,985 | 9,982 | 9,543
Capital expenditures (excluding acquisitions) |  |  |  |  |  |  |  |  | $ 17,644 | $ 15,674 | $ 11,783

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