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Segment reporting (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jul. 01, 2017 USD ($) | Jun. 30, 2018 USD ($) segment | Jul. 01, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 2,577,014 | $ 2,453,038 | $ 4,989,216 | $ 4,673,683 |
Operating income (loss) | 326,307 | 355,825 | 594,706 | 630,609 |
Assets | 12,894,039 |  | 12,894,039 |  | $ 12,094,853
Global Ceramic segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 929,297 | 902,670 | 1,805,845 | 1,687,639 |
Flooring NA segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,057,570 | 1,040,299 | 2,007,928 | 1,979,796 |
Flooring ROW segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 590,147 | 510,069 | 1,175,443 | 1,006,248 |
Operating segments | Global Ceramic segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 929,297 | 902,670 | 1,805,845 | 1,687,639 |
Operating income (loss) | 134,760 | 152,557 | 248,177 | 268,593 |
Assets | 4,974,791 |  | 4,974,791 |  | 4,838,310
Operating segments | Flooring NA segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,057,570 | 1,040,299 | 2,007,928 | 1,979,795 |
Operating income (loss) | 100,662 | 127,482 | 175,410 | 219,624 |
Assets | 3,927,190 |  | 3,927,190 |  | 3,702,137
Operating segments | Flooring ROW segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 590,147 | 510,069 | 1,175,443 | 1,006,249 |
Operating income (loss) | 100,166 | 86,052 | 189,226 | 162,147 |
Assets | 3,701,419 |  | 3,701,419 |  | 3,245,424
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) | (9,281) | $ (10,266) | (18,107) | $ (19,755) |
Assets | $ 290,639 |  | $ 290,639 |  | $ 308,982

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