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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. 01, 2017 | Jul. 02, 2016 | Jul. 01, 2017 | Jul. 02, 2016 | Dec. 31, 2016
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | $ 810,332 |  |
Intangible assets recognized or adjusted during the period |  |  | 3,175 |  |
Currency translation during the period |  |  | 52,263 |  |
Intangible assets subject to amortization, ending balance | $ 865,770 |  | 865,770 |  |
Accumulated amortization, beginning balance |  |  | 555,873 |  |
Amortization during the period | 9,322 | $ 9,494 | 19,381 | $ 19,058 |
Currency translation during the period |  |  | 37,214 |  |
Accumulated amortization, ending balance | 612,468 |  | 612,468 |  |
Intangible assets subject to amortization, net | 253,302 |  | 253,302 |  | $ 254,459
Customer relationships |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 569,980 |  |
Intangible assets recognized or adjusted during the period |  |  | 3,175 |  |
Currency translation during the period |  |  | 31,814 |  |
Intangible assets subject to amortization, ending balance | 604,969 |  | 604,969 |  |
Accumulated amortization, beginning balance |  |  | 334,276 |  |
Amortization during the period |  |  | 12,945 |  |
Currency translation during the period |  |  | 17,851 |  |
Accumulated amortization, ending balance | 365,072 |  | 365,072 |  |
Intangible assets subject to amortization, net | 239,897 |  | 239,897 |  |
Patents |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 234,022 |  |
Intangible assets recognized or adjusted during the period |  |  | 0 |  |
Currency translation during the period |  |  | 20,158 |  |
Intangible assets subject to amortization, ending balance | 254,180 |  | 254,180 |  |
Accumulated amortization, beginning balance |  |  | 220,598 |  |
Amortization during the period |  |  | 6,404 |  |
Currency translation during the period |  |  | 19,362 |  |
Accumulated amortization, ending balance | 246,364 |  | 246,364 |  |
Intangible assets subject to amortization, net | 7,816 |  | 7,816 |  |
Other |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 6,330 |  |
Intangible assets recognized or adjusted during the period |  |  | 0 |  |
Currency translation during the period |  |  | 291 |  |
Intangible assets subject to amortization, ending balance | 6,621 |  | 6,621 |  |
Accumulated amortization, beginning balance |  |  | 999 |  |
Amortization during the period |  |  | 32 |  |
Currency translation during the period |  |  | 1 |  |
Accumulated amortization, ending balance | 1,032 |  | 1,032 |  |
Intangible assets subject to amortization, net | $ 5,589 |  | $ 5,589 |  |

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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=98514028&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=66006027&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=66006027&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=66006027&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=66006027&loc=d3e16323-109275 + Details
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