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Goodwill and intangible assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 29, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |
Goodwill allocation | $ 12 |
Goodwill | 1,721,792 | 1,736,092
Laminate and Wood Segment [Member] |  |
Goodwill [Line Items] |  |
Enterprise value | 303 |
Goodwill allocation | 2,509 |
Goodwill | 809,174 | 808,210
Unidentified Wood Business [Member] | Laminate and Wood Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill | $ 1,396 |

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