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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
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Mar. 29, 2020 | Mar. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Revenues | $ 51,049 | $ 87,035
Cost of sales | (35,202) | (49,163)
Gross profit | 15,847 | 37,872
Selling, general and administrative expenses | (17,519) | (24,831)
Research and development expenses | (8,499) | (10,907)
Amortization of intangibles | 0 | (5,178)
Asset impairment of discontinued operations | (23,197) | 0
Interest expense, net | (206) | (206)
Non-operating pension income (cost) | (85) | (56)
Loss before taxes | $ (33,659) | $ (3,306)

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