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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 28, 2014 | Jun. 29, 2013 | Jun. 28, 2014 | Jun. 29, 2013 | Dec. 31, 2013
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | $ 692,046 |  |
Currency translation during the period |  |  | (5,776) |  |
Intangible assets subject to amortization, ending balance | 686,270 |  | 686,270 |  |
Accumulated amortization, beginning balance |  |  | 581,036 |  |
Amortization during the period | 6,509 | 6,774 | 12,547 | 12,748 |
Currency translation during the period |  |  | (5,223) |  |
Accumulated amortization, ending balance | 588,360 |  | 588,360 |  |
Intangible assets subject to amortization, net | 97,910 |  | 97,910 |  | 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 |  |  | (2,295) |  |
Intangible assets subject to amortization, ending balance | 381,064 |  | 381,064 |  |
Accumulated amortization, beginning balance |  |  | 342,361 |  |
Amortization during the period |  |  | 3,528 |  |
Currency translation during the period |  |  | (2,503) |  |
Accumulated amortization, ending balance | 343,386 |  | 343,386 |  |
Intangible assets subject to amortization, net | 37,678 |  | 37,678 |  |
Patents [Member] |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 307,186 |  |
Currency translation during the period |  |  | (3,494) |  |
Intangible assets subject to amortization, ending balance | 303,692 |  | 303,692 |  |
Accumulated amortization, beginning balance |  |  | 238,115 |  |
Amortization during the period |  |  | 8,957 |  |
Currency translation during the period |  |  | (2,726) |  |
Accumulated amortization, ending balance | 244,346 |  | 244,346 |  |
Intangible assets subject to amortization, net | 59,346 |  | 59,346 |  |
Other [Member] |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets subject to amortization, beginning balance |  |  | 1,501 |  |
Currency translation during the period |  |  | 13 |  |
Intangible assets subject to amortization, ending balance | 1,514 |  | 1,514 |  |
Accumulated amortization, beginning balance |  |  | 560 |  |
Amortization during the period |  |  | 62 |  |
Currency translation during the period |  |  | 6 |  |
Accumulated amortization, ending balance | 628 |  | 628 |  |
Intangible assets subject to amortization, net | $ 886 |  | $ 886 |  |

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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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