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Discontinued Operations - Operating Results of the Disposal Group (Details) - Grass Valley - Discontinued Operations, Held-for-sale [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 28, 2020 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Revenues | $ 56,812 | $ 89,178 | $ 107,861 | $ 176,213
Cost of sales | (33,989) | (53,227) | (69,191) | (102,390)
Gross profit | 22,823 | 35,951 | 38,670 | 73,823
Selling, general and administrative expenses | (19,342) | (20,030) | (36,861) | (44,861)
Research and development expenses | (5,974) | (10,259) | (14,473) | (21,166)
Amortization of intangibles | 0 | (3,299) | 0 | (8,477)
Asset impairment of discontinued operations | (89,810) | 0 | (113,007) | 0
Interest expense, net | (214) | (207) | (420) | (413)
Non-operating pension cost | (111) | (55) | (196) | (111)
Income (loss) before taxes | $ (92,628) | $ 2,101 | $ (126,287) | $ (1,205)

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