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Goodwill and intangible assets (Schedule of intangible assets subject to amortization) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 04, 2015 | Jun. 28, 2014 | Jul. 04, 2015 | Jun. 28, 2014 | Dec. 31, 2014
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | $ 626,713 |  |
Intangible assets acquired during the period |  |  | 224,326 |  |
Currency translation during the period |  |  | (42,543) |  |
Intangible assets subject to amortization, ending balance | $ 808,496 |  | 808,496 |  |
Accumulated amortization, beginning balance |  |  | 547,395 |  |
Amortization during the period | 6,264 | $ 6,509 | 11,370 | $ 12,547 |
Currency translation during the period |  |  | (36,669) |  |
Accumulated amortization, ending balance | 522,096 |  | 522,096 |  |
Intangible assets subject to amortization, net | 286,400 |  | 286,400 |  | $ 79,318
Customer Relationships [Member] |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 354,768 |  |
Intangible assets acquired during the period |  |  | 223,825 |  |
Currency translation during the period |  |  | (19,364) |  |
Intangible assets subject to amortization, ending balance | 559,229 |  | 559,229 |  |
Accumulated amortization, beginning balance |  |  | 320,851 |  |
Amortization during the period |  |  | 4,473 |  |
Currency translation during the period |  |  | (17,301) |  |
Accumulated amortization, ending balance | 308,023 |  | 308,023 |  |
Intangible assets subject to amortization, net | 251,206 |  | 251,206 |  |
Patents [Member] |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 270,466 |  |
Intangible assets acquired during the period |  |  | 0 |  |
Currency translation during the period |  |  | (23,179) |  |
Intangible assets subject to amortization, ending balance | 247,287 |  | 247,287 |  |
Accumulated amortization, beginning balance |  |  | 225,875 |  |
Amortization during the period |  |  | 6,892 |  |
Currency translation during the period |  |  | (19,383) |  |
Accumulated amortization, ending balance | 213,384 |  | 213,384 |  |
Intangible assets subject to amortization, net | 33,903 |  | 33,903 |  |
Other [Member] |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 1,479 |  |
Intangible assets acquired during the period |  |  | 501 |  |
Currency translation during the period |  |  | 0 |  |
Intangible assets subject to amortization, ending balance | 1,980 |  | 1,980 |  |
Accumulated amortization, beginning balance |  |  | 669 |  |
Amortization during the period |  |  | 5 |  |
Currency translation during the period |  |  | 15 |  |
Accumulated amortization, ending balance | 689 |  | 689 |  |
Intangible assets subject to amortization, net | $ 1,291 |  | $ 1,291 |  |

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- Definition Finite-Lived Intangible Assets, Accumulated Amortization, Translation Adjustments + References No definition available. + Details
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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 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: 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=31042434&loc=d3e3602-108585 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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before 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=26713463&loc=d3e16323-109275 + Details
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