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Goodwill and intangible assets - Schedule of intangible assets subject to amortization (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Dec. 31, 2017
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | $ 899,057 |  |
Intangible assets recognized during the period | 7 |  |
Currency translation during the period | 19,126 |  |
Intangible assets subject to amortization, ending balance | 918,190 |  |
Accumulated amortization, beginning balance | 651,498 |  |
Amortization during the period | 7,567 | $ 10,059 |
Currency translation during the period | 13,485 |  |
Accumulated amortization, ending balance | 672,550 |  |
Intangible assets subject to amortization, net | 245,640 |  | $ 247,559
Customer relationships |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 625,263 |  |
Intangible assets recognized during the period | 0 |  |
Currency translation during the period | 11,865 |  |
Intangible assets subject to amortization, ending balance | 637,128 |  |
Accumulated amortization, beginning balance | 390,428 |  |
Amortization during the period | 6,975 |  |
Currency translation during the period | 6,577 |  |
Accumulated amortization, ending balance | 403,980 |  |
Intangible assets subject to amortization, net | 233,148 |  |
Patents |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 266,969 |  |
Intangible assets recognized during the period | 0 |  |
Currency translation during the period | 7,082 |  |
Intangible assets subject to amortization, ending balance | 274,051 |  |
Accumulated amortization, beginning balance | 259,908 |  |
Amortization during the period | 583 |  |
Currency translation during the period | 6,898 |  |
Accumulated amortization, ending balance | 267,389 |  |
Intangible assets subject to amortization, net | 6,662 |  |
Other |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Intangible assets subject to amortization, beginning balance | 6,825 |  |
Intangible assets recognized during the period | 7 |  |
Currency translation during the period | 179 |  |
Intangible assets subject to amortization, ending balance | 7,011 |  |
Accumulated amortization, beginning balance | 1,162 |  |
Amortization during the period | 9 |  |
Currency translation during the period | 10 |  |
Accumulated amortization, ending balance | 1,181 |  |
Intangible assets subject to amortization, net | $ 5,830 |  |

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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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- 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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