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Segment reporting (Summary of segment information) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 04, 2015 USD ($) | Jun. 28, 2014 USD ($) | Jul. 04, 2015 USD ($) segment | Jun. 28, 2014 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | segment |  |  | 3 |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 2,041,733 | $ 2,048,247 | $ 3,922,910 | $ 3,861,342 |
Operating income (loss) | 255,816 | 222,248 | 299,590 | 352,983 |
Assets | 10,165,670 |  | 10,165,670 |  | $ 8,285,544
Operating Segments [Member] | Global Ceramic Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 789,802 | 796,724 | 1,509,630 | 1,491,818 |
Operating income (loss) | 121,189 | 106,407 | 206,516 | 167,066 |
Assets | 3,950,088 |  | 3,950,088 |  | 3,542,594
Operating Segments [Member] | Flooring NA Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 920,337 | 895,912 | 1,767,248 | 1,676,243 |
Operating income (loss) | 95,143 | 76,602 | 19,951 | 123,955 |
Assets | 3,182,465 |  | 3,182,465 |  | 2,587,151
Operating Segments [Member] | Flooring ROW Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 331,622 | 357,738 | 646,364 | 695,804 |
Operating income (loss) | 53,052 | 47,398 | 97,693 | 78,864 |
Assets | 2,710,895 |  | 2,710,895 |  | 1,909,487
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Intersegment sales | (28) | (2,127) | (332) | (2,523) |
Operating income (loss) | (13,568) | $ (8,159) | (24,570) | $ (16,902) |
Assets | $ 322,222 |  | $ 322,222 |  | $ 246,312

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