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Discontinued Operations - Operating Results of the Disposal Group (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2020 | Jul. 04, 2021 | Jun. 28, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Asset impairment of discontinued operations |  | $ (6,995) | $ (113,007)
Grass Valley |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Asset impairment of discontinued operations | $ (89,800) |  | (113,000)
Grass Valley | Discontinued Operations, Held-for-sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Revenues | 56,812 |  | 107,861
Cost of sales | (33,989) |  | (69,191)
Gross profit | 22,823 |  | 38,670
Selling, general and administrative expenses | (19,342) |  | (36,861)
Research and development expenses | (5,974) |  | (14,473)
Asset impairment of discontinued operations | (89,810) |  | (113,007)
Interest expense, net | (214) |  | (420)
Non-operating pension cost | (111) |  | (196)
Loss before taxes | $ (92,628) |  | $ (126,287)

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