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Goodwill and intangible assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 28, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |
Goodwill | $ 1,730,713 | $ 1,736,092
Laminate and Wood Segment [Member] |  |
Goodwill [Line Items] |  |
Enterprise value | 303 |
Goodwill | 810,096 | 808,210
Unidentified Wood Business [Member] | Laminate and Wood Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill | $ 6,662 |

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