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Goodwill and intangible assets - Schedule of intangible assets subject to amortization (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 28, 2020 | Mar. 30, 2019 | Dec. 31, 2019
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | $ 900,937 |  |
Intangible assets recognized during the period | 12,789 |  |
Currency translation during the period | (11,062) |  |
Intangible assets subject to amortization, ending balance | 902,664 |  |
Accumulated amortization, beginning balance | 674,790 |  |
Amortization during the period | 6,876 | $ 6,729 |
Currency translation during the period | (4,122) |  |
Accumulated amortization, ending balance | 677,544 |  |
Intangible assets subject to amortization, net | 225,120 |  | $ 226,147
Customer relationships |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 645,206 |  |
Intangible assets recognized during the period | 12,789 |  |
Currency translation during the period | (9,387) |  |
Intangible assets subject to amortization, ending balance | 648,608 |  |
Accumulated amortization, beginning balance | 426,765 |  |
Amortization during the period | 6,324 |  |
Currency translation during the period | (2,670) |  |
Accumulated amortization, ending balance | 430,419 |  |
Intangible assets subject to amortization, net | 218,189 |  |
Patents |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 249,100 |  |
Intangible assets recognized during the period | 0 |  |
Currency translation during the period | (1,471) |  |
Intangible assets subject to amortization, ending balance | 247,629 |  |
Accumulated amortization, beginning balance | 246,872 |  |
Amortization during the period | 510 |  |
Currency translation during the period | (1,445) |  |
Accumulated amortization, ending balance | 245,937 |  |
Intangible assets subject to amortization, net | 1,692 |  |
Other |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 6,631 |  |
Intangible assets recognized during the period | 0 |  |
Currency translation during the period | (204) |  |
Intangible assets subject to amortization, ending balance | 6,427 |  |
Accumulated amortization, beginning balance | 1,153 |  |
Amortization during the period | 42 |  |
Currency translation during the period | (7) |  |
Accumulated amortization, ending balance | 1,188 |  |
Intangible assets subject to amortization, net | $ 5,239 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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/disclosureRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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