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Goodwill and intangible assets (Schedule of intangible assets subject to amortization) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2013 | Jun. 30, 2012 | Jun. 29, 2013 | Jun. 30, 2012
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | $ 98,296 |
Intangible assets acquired during the period |  |  | 36,980 |
Amortization during the period | (6,774) | (15,998) | (12,748) | (32,259)
Currency translation during the period |  |  | (2,106) |
Intangible assets subject to amortization, ending balance | 120,422 |  | 120,422 |
Customer Relationships [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 26,210 |
Intangible assets acquired during the period |  |  | 21,792 |
Amortization during the period |  |  | (3,147) |
Currency translation during the period |  |  | (310) |
Intangible assets subject to amortization, ending balance | 44,545 |  | 44,545 |
Patents [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 71,031 |
Intangible assets acquired during the period |  |  | 15,188 |
Amortization during the period |  |  | (9,541) |
Currency translation during the period |  |  | (1,548) |
Intangible assets subject to amortization, ending balance | 75,130 |  | 75,130 |
Other [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 1,055 |
Intangible assets acquired during the period |  |  | 0 |
Amortization during the period |  |  | (60) |
Currency translation during the period |  |  | (248) |
Intangible assets subject to amortization, ending balance | $ 747 |  | $ 747 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance with a finite life acquired. + References No definition available. + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of increase (decrease) to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments and purchase accounting adjustments. + References No definition available. + Details
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