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Goodwill and intangible assets - Schedule of intangible assets subject to amortization (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 01, 2017 | Apr. 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 | 827 |  |
Currency translation during the period | 8,142 |  |
Intangible assets subject to amortization, ending balance | 819,301 |  |
Accumulated amortization, beginning balance | 555,873 |  |
Amortization during the period | 10,059 | $ 9,564 |
Currency translation during the period | 5,605 |  |
Accumulated amortization, ending balance | 571,537 |  |
Intangible assets subject to amortization, net | 247,764 |  | $ 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 | 827 |  |
Currency translation during the period | 5,049 |  |
Intangible assets subject to amortization, ending balance | 575,856 |  |
Accumulated amortization, beginning balance | 334,276 |  |
Amortization during the period | 6,397 |  |
Currency translation during the period | 2,762 |  |
Accumulated amortization, ending balance | 343,435 |  |
Intangible assets subject to amortization, net | 232,421 |  |
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 | 3,020 |  |
Intangible assets subject to amortization, ending balance | 237,042 |  |
Accumulated amortization, beginning balance | 220,598 |  |
Amortization during the period | 3,652 |  |
Currency translation during the period | 2,841 |  |
Accumulated amortization, ending balance | 227,091 |  |
Intangible assets subject to amortization, net | 9,951 |  |
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 | 73 |  |
Intangible assets subject to amortization, ending balance | 6,403 |  |
Accumulated amortization, beginning balance | 999 |  |
Amortization during the period | 10 |  |
Currency translation during the period | 2 |  |
Accumulated amortization, ending balance | 1,011 |  |
Intangible assets subject to amortization, net | $ 5,392 |  |

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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=66902209&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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- 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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