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Goodwill - Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 29, 2019 | Jun. 30, 2018 | Jun. 29, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Document Period End Date |  |  | Jun. 29, 2019 |  |
Gross Carrying Amount | $ 521,570 |  | $ 521,570 |  | $ 602,330
Accumulated Amortization | (231,334) |  | (231,334) |  | (229,686)
Net | 290,236 |  | 290,236 |  | $ 372,644
Amortization of Intangible Assets | 11,413 | $ 11,955 | $ 23,343 | $ 25,475 |
Customer Relationships [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-Average Life |  |  | 10 years |  | 11 years
Gross Carrying Amount | 443,223 |  | $ 443,223 |  | $ 475,050
Accumulated Amortization | (225,446) |  | (225,446) |  | (221,822)
Net | 217,777 |  | $ 217,777 |  | $ 253,228
Developed Technology [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-Average Life |  |  | 5 years |  | 5 years
Gross Carrying Amount | 1,940 |  | $ 1,940 |  | $ 6,340
Accumulated Amortization | (1,035) |  | (1,035) |  | (4,311)
Net | 905 |  | $ 905 |  | $ 2,029
Amortizable Trade Name [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted-Average Life |  |  | 8 years |  | 9 years
Gross Carrying Amount | 76,407 |  | $ 76,407 |  | $ 19,940
Accumulated Amortization | (4,853) |  | (4,853) |  | (3,553)
Net | 71,554 |  | 71,554 |  | 16,387
Trade Names [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount |  |  |  |  | 101,000
Impairment of Intangible Assets, Finite-lived | 55,000 |  | $ 55,000 |  |
Impairment of Intangible Assets (Excluding Goodwill) | 46,000 |  |  |  |
Accumulated Amortization |  |  |  |  | 0
Net |  |  |  |  | $ 101,000
Net of Tax [Member] | Trade Names [Member] |  |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) | $ 34,653 |  |  |  |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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