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Segment reporting (Summary of segment information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 29, 2013 | Jun. 30, 2012 | Jun. 29, 2013 segment | Jun. 30, 2012 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 1,976,299 | $ 1,469,793 | $ 3,463,114 | $ 2,878,828 |
Intersegment sales | (25,717) | (23,362) | (50,592) | (44,556) |
Operating income (loss) | 133,198 | 107,718 | 220,040 | 179,694 |
Assets | 8,508,964 |  | 8,508,964 |  | 6,303,684
Number of reporting segments |  |  | 3 |  |
Carpet Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 770,868 | 734,493 | 1,466,202 | 1,434,373 |
Operating income (loss) | 54,862 | 37,136 | 80,100 | 62,418 |
Assets | 1,803,212 |  | 1,803,212 |  | 1,721,214
Ceramic Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 760,168 | 404,288 | 1,172,049 | 797,213 |
Operating income (loss) | 46,304 | 36,432 | 76,280 | 62,460 |
Assets | 3,832,888 |  | 3,832,888 |  | 1,731,258
Laminate and Wood Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 470,980 | 354,374 | 875,455 | 691,798 |
Operating income (loss) | 41,362 | 40,575 | 80,055 | 67,721 |
Assets | 2,691,553 |  | 2,691,553 |  | 2,672,389
Corporate and Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (9,330) | (6,425) | (16,395) | (12,905) |
Assets | $ 181,311 |  | $ 181,311 |  | $ 178,823

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