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Segment reporting (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 01, 2017 USD ($) | Jul. 02, 2016 USD ($) | Jul. 01, 2017 USD ($) segment | Jul. 02, 2016 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 2,453,038 | $ 2,310,336 | $ 4,673,683 | $ 4,482,382 |
Operating income (loss) | 355,825 | 350,692 | 630,609 | 596,364 |
Assets | 11,589,491 |  | 11,589,491 |  | $ 10,230,596
Operating segments | Global Ceramic segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 902,670 | 829,794 | 1,687,639 | 1,603,520 |
Operating income (loss) | 152,557 | 140,606 | 268,593 | 240,383 |
Assets | 4,736,068 |  | 4,736,068 |  | 4,024,859
Operating segments | Flooring NA segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,040,299 | 980,693 | 1,979,795 | 1,887,057 |
Operating income (loss) | 127,482 | 118,946 | 219,624 | 194,297 |
Assets | 3,625,350 |  | 3,625,350 |  | 3,410,856
Operating segments | Flooring ROW segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 510,069 | 499,849 | 1,006,249 | 991,805 |
Operating income (loss) | 86,052 | 101,062 | 162,147 | 180,599 |
Assets | 2,984,716 |  | 2,984,716 |  | 2,689,592
Intersegment sales |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 0 | 0 | 0 | 0 |
Corporate and intersegment eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (10,266) | $ (9,922) | (19,755) | $ (18,915) |
Assets | $ 243,357 |  | $ 243,357 |  | $ 105,289

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