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Discontinued Operations - Assets and Liabilities of the Disposal Group (Details) - Grass Valley - Discontinued Operations, Held-for-sale [Member] - USD ($) $ in Thousands | Jun. 28, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Cash and cash equivalents | $ 33,337 | $ 18,405
Receivables, net | 90,492 | 117,386
Inventories, net | 49,997 | 55,002
Other current assets | 38,626 | 35,187
Plant, property, and equipment, less accumulated depreciation | 65,056 | 61,233
Operating lease right-of-use assets | 15,631 | 16,902
Goodwill | 26,067 | 26,707
Intangible assets, less accumulated depreciation | 150,214 | 143,459
Deferred income taxes | 58,148 | 59,560
Other long-lived assets | 12,201 | 21,652
Impairment of disposal group | (289,447) | (180,358)
Total Assets of discontinued operations | 250,322 | 375,135
Liabilities |  |
Accounts payable | 42,482 | 52,425
Accrued liabilities | 38,816 | 83,349
Postretirement benefits | 4,976 | 6,224
Deferred income taxes | 2,404 | 2,740
Long-term operating lease liabilities | 18,745 | 20,459
Other long-term liabilities | 2,250 | 5,082
Total Liabilities of discontinued operations | $ 109,673 | $ 170,279

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