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Goodwill and intangible assets (Schedule of intangible assets subject to amortization) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2014 | Sep. 28, 2013 | Sep. 27, 2014 | Sep. 28, 2013 | Dec. 31, 2013
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | $ 692,046 |  |
Currency translation during the period |  |  | (43,788) |  |
Intangible assets subject to amortization, ending balance | 648,258 |  | 648,258 |  |
Accumulated amortization, beginning balance |  |  | 581,036 |  |
Amortization during the period | 6,140 | 13,288 | 18,687 | 19,262 |
Currency translation during the period |  |  | (39,009) |  |
Accumulated amortization, ending balance | 560,714 |  | 560,714 |  |
Intangible assets subject to amortization, net | 87,544 |  | 87,544 |  | 111,010
Customer Relationships [Member] |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 383,359 |  |
Currency translation during the period |  |  | (18,825) |  |
Intangible assets subject to amortization, ending balance | 364,534 |  | 364,534 |  |
Accumulated amortization, beginning balance |  |  | 342,361 |  |
Amortization during the period |  |  | 5,225 |  |
Currency translation during the period |  |  | (18,811) |  |
Accumulated amortization, ending balance | 328,775 |  | 328,775 |  |
Intangible assets subject to amortization, net | 35,759 |  | 35,759 |  |
Patents [Member] |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 307,186 |  |
Currency translation during the period |  |  | (24,957) |  |
Intangible assets subject to amortization, ending balance | 282,229 |  | 282,229 |  |
Accumulated amortization, beginning balance |  |  | 238,115 |  |
Amortization during the period |  |  | 13,369 |  |
Currency translation during the period |  |  | (20,194) |  |
Accumulated amortization, ending balance | 231,290 |  | 231,290 |  |
Intangible assets subject to amortization, net | 50,939 |  | 50,939 |  |
Other [Member] |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 1,501 |  |
Currency translation during the period |  |  | (6) |  |
Intangible assets subject to amortization, ending balance | 1,495 |  | 1,495 |  |
Accumulated amortization, beginning balance |  |  | 560 |  |
Amortization during the period |  |  | 93 |  |
Currency translation during the period |  |  | (4) |  |
Accumulated amortization, ending balance | 649 |  | 649 |  |
Intangible assets subject to amortization, net | $ 846 |  | $ 846 |  |

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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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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 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=26713463&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=26713463&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=26713463&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=26713463&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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