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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. 02, 2016 | Jul. 04, 2015 | Jul. 02, 2016 | Jul. 04, 2015 | Dec. 31, 2015
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | $ 838,764 |  |
Intangible assets recognized or adjusted during the period |  |  | 0 |  |
Currency translation during the period |  |  | 7,420 |  |
Intangible assets subject to amortization, ending balance | $ 846,184 |  | 846,184 |  |
Accumulated amortization, beginning balance |  |  | 534,572 |  |
Amortization during the period | 9,494 | $ 6,264 | 19,058 | $ 11,370 |
Currency translation during the period |  |  | 5,993 |  |
Accumulated amortization, ending balance | 559,623 |  | 559,623 |  |
Intangible assets subject to amortization, net | 286,561 |  | 286,561 |  | $ 304,192
Customer Relationships [Member] |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 588,716 |  |
Intangible assets recognized or adjusted during the period |  |  | 0 |  |
Currency translation during the period |  |  | 3,566 |  |
Intangible assets subject to amortization, ending balance | 592,282 |  | 592,282 |  |
Accumulated amortization, beginning balance |  |  | 317,593 |  |
Amortization during the period |  |  | 13,419 |  |
Currency translation during the period |  |  | 2,126 |  |
Accumulated amortization, ending balance | 333,138 |  | 333,138 |  |
Intangible assets subject to amortization, net | 259,144 |  | 259,144 |  |
Patents [Member] |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 243,258 |  |
Intangible assets recognized or adjusted during the period |  |  | 0 |  |
Currency translation during the period |  |  | 4,580 |  |
Intangible assets subject to amortization, ending balance | 247,838 |  | 247,838 |  |
Accumulated amortization, beginning balance |  |  | 216,273 |  |
Amortization during the period |  |  | 5,623 |  |
Currency translation during the period |  |  | 4,064 |  |
Accumulated amortization, ending balance | 225,960 |  | 225,960 |  |
Intangible assets subject to amortization, net | 21,878 |  | 21,878 |  |
Other [Member] |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 6,790 |  |
Intangible assets recognized or adjusted during the period |  |  | 0 |  |
Currency translation during the period |  |  | (726) |  |
Intangible assets subject to amortization, ending balance | 6,064 |  | 6,064 |  |
Accumulated amortization, beginning balance |  |  | 706 |  |
Amortization during the period |  |  | 16 |  |
Currency translation during the period |  |  | (197) |  |
Accumulated amortization, ending balance | 525 |  | 525 |  |
Intangible assets subject to amortization, net | $ 5,539 |  | $ 5,539 |  |

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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=56944662&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 Accumulated amount of 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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- 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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- 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=26713463&loc=d3e16323-109275 + Details
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