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Segment reporting (Summary of segment information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 28, 2014 | Jun. 29, 2013 | Jun. 28, 2014 segment | Jun. 29, 2013 | Dec. 31, 2013
Segment Reporting [Abstract] |  |  |  |  |
Number of reporting segments |  |  | 3 |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 2,048,247 | $ 1,976,299 | $ 3,861,342 | $ 3,463,114 |
Intersegment sales | (30,042) | (25,717) | (54,975) | (50,592) |
Operating income (loss) | 222,248 | 133,198 | 352,983 | 220,040 |
Assets | 8,881,681 |  | 8,881,681 |  | 8,494,177
Carpet Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 780,308 | 770,868 | 1,455,234 | 1,466,202 |
Operating income (loss) | 62,826 | 54,862 | 97,097 | 80,100 |
Assets | 1,960,106 |  | 1,960,106 |  | 1,786,085
Ceramic Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 796,724 | 760,168 | 1,491,818 | 1,172,049 |
Operating income (loss) | 106,407 | 46,304 | 167,066 | 76,280 |
Assets | 3,900,387 |  | 3,900,387 |  | 3,787,785
Laminate and Wood Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 501,257 | 470,980 | 969,265 | 875,455 |
Operating income (loss) | 60,843 | 41,362 | 104,962 | 80,055 |
Assets | 2,818,129 |  | 2,818,129 |  | 2,716,759
Corporate and Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) | (7,828) | (9,330) | (16,142) | (16,395) |
Assets | $ 203,059 |  | $ 203,059 |  | $ 203,548

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