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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 | Mar. 29, 2020 | Dec. 31, 2019
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Assets |  |
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents | $ 42,742 | $ 18,405
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | 88,895 | 117,386
Disposal Group, Including Discontinued Operation, Inventory | 53,635 | 55,002
Disposal Group, Including Discontinued Operation, Other Assets, Current | 46,659 | 35,187
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment | 59,200 | 61,233
Disposal Group, Including Discontinued Operation, Operating Lease, Right-of-Use Asset right-of-use asset | 15,050 | 16,902
Disposal Group, Including Discontinued Operation, Goodwill | 25,306 | 26,707
Disposal Group, Including Discontinued Operation, Intangible Assets | 139,055 | 143,459
Disposal Group, Including Discontinued Operation, Deferred Tax Assets | 57,868 | 59,560
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent | 19,357 | 21,652
Disposal Group, Including Discontinued Operation, Impairment of disposal group | (203,555) | (180,358)
Disposal Group, Including Discontinued Operation, Assets | 344,212 | 375,135
Liabilities |  |
Disposal Group, Including Discontinued Operation, Accounts Payable | 42,683 | 52,425
Disposal Group, Including Discontinued Operation, Accrued Liabilities | 63,838 | 83,349
Disposal Group, Including Discontinued Operation, Postretirement Plan Benefit Obligation | 5,310 | 6,224
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities | 3,925 | 2,740
Disposal Group, Including Discontinued Operations, Operating Lease, Liability, Noncurrent | 18,357 | 20,459
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent | 1,342 | 5,082
Disposal Group, Including Discontinued Operation, Liabilities | $ 135,455 | $ 170,279

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