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Nature of Operations and Summary of Significant Accounting Policies - Intangible Assets By Major Asset Class (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 30, 2017
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | $ 178,755 | $ 178,783
Currency Translation | (4,850) | (1,655)
Accumulated Amortization | (68,312) | (60,997)
Net | 105,593 | 116,131
Acquired Intangible Assets [Abstract] |  |
Gross | 195,355 | 195,383
Currency Translation | (4,801) | (1,350)
Net | 122,242 | 133,036
Trade Names [Member] |  |
Acquired Indefinite-Lived Intangible Assets [Line Items] |  |
Gross | 16,600 | 16,600
Currency Translation | 49 | 305
Net | 16,649 | 16,905
Customer Relationships [Member] |  |
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | 113,283 | 113,301
Currency Translation | (3,058) | (621)
Accumulated Amortization | (33,555) | (28,789)
Net | 76,670 | 83,891
Product Technology [Member] |  |
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | 46,501 | 46,501
Currency Translation | (1,351) | (737)
Accumulated Amortization | (21,733) | (19,841)
Net | 23,417 | 25,923
Trade Names [Member] |  |
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | 5,227 | 5,227
Currency Translation | (345) | (262)
Accumulated Amortization | (1,747) | (1,504)
Net | 3,135 | 3,461
Other Intangibles [Member] |  |
Acquired Definite-Lived Intangible Assets [Line Items] |  |
Gross | 13,744 | 13,754
Currency Translation | (96) | (35)
Accumulated Amortization | (11,277) | (10,863)
Net | $ 2,371 | $ 2,856

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