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Goodwill and intangible assets - Schedule of intangible assets subject to amortization (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 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 |  |  | 22,143 |  |
Intangible assets subject to amortization, ending balance | $ 935,869 |  | 935,869 |  |
Accumulated amortization, beginning balance |  |  | 674,790 |  |
Amortization during the period | 7,327 | $ 6,912 | 21,183 | $ 20,596 |
Currency translation during the period |  |  | 19,684 |  |
Accumulated amortization, ending balance | 715,657 |  | 715,657 |  |
Intangible assets subject to amortization, net | 220,212 |  | 220,212 |  | $ 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 |  |  | 12,622 |  |
Intangible assets subject to amortization, ending balance | 670,617 |  | 670,617 |  |
Accumulated amortization, beginning balance |  |  | 426,765 |  |
Amortization during the period |  |  | 19,531 |  |
Currency translation during the period |  |  | 10,173 |  |
Accumulated amortization, ending balance | 456,469 |  | 456,469 |  |
Intangible assets subject to amortization, net | 214,148 |  | 214,148 |  |
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 |  |  | 9,548 |  |
Intangible assets subject to amortization, ending balance | 258,648 |  | 258,648 |  |
Accumulated amortization, beginning balance |  |  | 246,872 |  |
Amortization during the period |  |  | 1,595 |  |
Currency translation during the period |  |  | 9,495 |  |
Accumulated amortization, ending balance | 257,962 |  | 257,962 |  |
Intangible assets subject to amortization, net | 686 |  | 686 |  |
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 |  |  | (27) |  |
Intangible assets subject to amortization, ending balance | 6,604 |  | 6,604 |  |
Accumulated amortization, beginning balance |  |  | 1,153 |  |
Amortization during the period |  |  | 57 |  |
Currency translation during the period |  |  | 16 |  |
Accumulated amortization, ending balance | 1,226 |  | 1,226 |  |
Intangible assets subject to amortization, net | $ 5,378 |  | $ 5,378 |  |

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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=121586364&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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