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Goodwill and intangible assets - Schedule of intangible assets subject to amortization (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 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 |  |  | (18,416) |  |
Intangible assets subject to amortization, ending balance | $ 880,648 |  | 880,648 |  |
Accumulated amortization, beginning balance |  |  | 651,498 |  |
Amortization during the period | 7,483 | $ 9,322 | 15,050 | $ 19,381 |
Currency translation during the period |  |  | (14,067) |  |
Accumulated amortization, ending balance | 652,481 |  | 652,481 |  |
Intangible assets subject to amortization, net | 228,167 |  | 228,167 |  | $ 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 |  |  | (11,108) |  |
Intangible assets subject to amortization, ending balance | 614,155 |  | 614,155 |  |
Accumulated amortization, beginning balance |  |  | 390,428 |  |
Amortization during the period |  |  | 13,875 |  |
Currency translation during the period |  |  | (7,051) |  |
Accumulated amortization, ending balance | 397,252 |  | 397,252 |  |
Intangible assets subject to amortization, net | 216,903 |  | 216,903 |  |
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 |  |  | (7,185) |  |
Intangible assets subject to amortization, ending balance | 259,784 |  | 259,784 |  |
Accumulated amortization, beginning balance |  |  | 259,908 |  |
Amortization during the period |  |  | 1,155 |  |
Currency translation during the period |  |  | (7,006) |  |
Accumulated amortization, ending balance | 254,057 |  | 254,057 |  |
Intangible assets subject to amortization, net | 5,727 |  | 5,727 |  |
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 |  |  | (123) |  |
Intangible assets subject to amortization, ending balance | 6,709 |  | 6,709 |  |
Accumulated amortization, beginning balance |  |  | 1,162 |  |
Amortization during the period |  |  | 20 |  |
Currency translation during the period |  |  | (10) |  |
Accumulated amortization, ending balance | 1,172 |  | 1,172 |  |
Intangible assets subject to amortization, net | $ 5,537 |  | $ 5,537 |  |

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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=109223946&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://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 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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