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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. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 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 |  |  | 74,817 |  |
Intangible assets subject to amortization, ending balance | $ 888,324 |  | 888,324 |  |
Accumulated amortization, beginning balance |  |  | 555,873 |  |
Amortization during the period | 7,421 | $ 10,381 | 26,802 | $ 29,439 |
Currency translation during the period |  |  | 53,419 |  |
Accumulated amortization, ending balance | 636,094 |  | 636,094 |  |
Intangible assets subject to amortization, net | 252,230 |  | 252,230 |  | $ 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 |  |  | 45,597 |  |
Intangible assets subject to amortization, ending balance | 618,752 |  | 618,752 |  |
Accumulated amortization, beginning balance |  |  | 334,276 |  |
Amortization during the period |  |  | 19,710 |  |
Currency translation during the period |  |  | 25,689 |  |
Accumulated amortization, ending balance | 379,675 |  | 379,675 |  |
Intangible assets subject to amortization, net | 239,077 |  | 239,077 |  |
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 |  |  | 28,778 |  |
Intangible assets subject to amortization, ending balance | 262,800 |  | 262,800 |  |
Accumulated amortization, beginning balance |  |  | 220,598 |  |
Amortization during the period |  |  | 6,970 |  |
Currency translation during the period |  |  | 27,706 |  |
Accumulated amortization, ending balance | 255,274 |  | 255,274 |  |
Intangible assets subject to amortization, net | 7,526 |  | 7,526 |  |
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 |  |  | 442 |  |
Intangible assets subject to amortization, ending balance | 6,772 |  | 6,772 |  |
Accumulated amortization, beginning balance |  |  | 999 |  |
Amortization during the period |  |  | 122 |  |
Currency translation during the period |  |  | 24 |  |
Accumulated amortization, ending balance | 1,145 |  | 1,145 |  |
Intangible assets subject to amortization, net | $ 5,627 |  | $ 5,627 |  |

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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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