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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. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018 | Dec. 31, 2018
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | $ 912,030 |  |
Intangible assets recognized during the period |  |  | 2,092 |  |
Currency translation during the period |  |  | (31,529) |  |
Intangible assets subject to amortization, ending balance | $ 882,593 |  | 882,593 |  |
Accumulated amortization, beginning balance |  |  | 657,601 |  |
Amortization during the period | 6,912 | $ 8,148 | 20,596 | $ 23,198 |
Currency translation during the period |  |  | (22,769) |  |
Accumulated amortization, ending balance | 655,428 |  | 655,428 |  |
Intangible assets subject to amortization, net | 227,165 |  | 227,165 |  | $ 254,430
Customer relationships |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 651,012 |  |
Intangible assets recognized during the period |  |  | 2,092 |  |
Currency translation during the period |  |  | (20,143) |  |
Intangible assets subject to amortization, ending balance | 632,961 |  | 632,961 |  |
Accumulated amortization, beginning balance |  |  | 406,386 |  |
Amortization during the period |  |  | 19,027 |  |
Currency translation during the period |  |  | (11,722) |  |
Accumulated amortization, ending balance | 413,691 |  | 413,691 |  |
Intangible assets subject to amortization, net | 219,270 |  | 219,270 |  |
Patents |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 254,483 |  |
Intangible assets recognized during the period |  |  | 0 |  |
Currency translation during the period |  |  | (11,213) |  |
Intangible assets subject to amortization, ending balance | 243,270 |  | 243,270 |  |
Accumulated amortization, beginning balance |  |  | 249,988 |  |
Amortization during the period |  |  | 1,606 |  |
Currency translation during the period |  |  | (11,028) |  |
Accumulated amortization, ending balance | 240,566 |  | 240,566 |  |
Intangible assets subject to amortization, net | 2,704 |  | 2,704 |  |
Other |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 6,535 |  |
Intangible assets recognized during the period |  |  | 0 |  |
Currency translation during the period |  |  | (173) |  |
Intangible assets subject to amortization, ending balance | 6,362 |  | 6,362 |  |
Accumulated amortization, beginning balance |  |  | 1,227 |  |
Amortization during the period |  |  | (37) |  |
Currency translation during the period |  |  | (19) |  |
Accumulated amortization, ending balance | 1,171 |  | 1,171 |  |
Intangible assets subject to amortization, net | $ 5,191 |  | $ 5,191 |  |

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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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