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Goodwill and intangible assets (Summary of Changes - Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Net, Opening | $ 183,524 | $ 195,008 |
Acquisitions | 0 | 0 |
Impairments | (456) |  |
Intangible asset amortization | (11,195) | (11,282) | $ (4,951)
Finite Lived Intangible Assets Foreign Currency Translation Gain Loss | 186 | (202) |
Finite-Lived Intangible Assets, Net, Ending | 172,059 | 183,524 | 195,008
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Net, Opening | 183,258 | 194,633 |
Acquisitions | 0 | 0 |
Impairments | (456) |  |
Intangible asset amortization | (11,086) | (11,166) |
Finite Lived Intangible Assets Foreign Currency Translation Gain Loss | 186 | (209) |
Finite-Lived Intangible Assets, Net, Ending | 171,902 | 183,258 | 194,633
Patents, Trademarks and Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Net, Opening | 266 | 375 |
Acquisitions | 0 | 0 |
Impairments | 0 |  |
Intangible asset amortization | (109) | (116) |
Finite Lived Intangible Assets Foreign Currency Translation Gain Loss | 0 | 7 |
Finite-Lived Intangible Assets, Net, Ending | $ 157 | $ 266 | $ 375

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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 Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + 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 The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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