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Reportable Segments - Reconciliation of Total Reportable Segments' Revenues and EBITDA to Consolidated Revenues and Consolidated Income Before Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Goodwill and other asset impairment | $ 342,146 | $ 0 | $ 342,146 | $ 0
Segment revenues | 620,318 | 655,774 | 1,845,023 | 1,929,978
Amortization of intangibles | (22,243) | (25,533) | (67,952) | (74,990)
Depreciation expense | (12,100) | (11,700) | (37,200) | (35,600)
Severance, restructuring, and acquisition integration costs | 4,045 | 11,688 | 10,904 | 57,010
Gain from patent litigation | 0 | 62,141 | 0 | 62,141
Operating income (loss) | (280,507) | 131,278 | (174,923) | 231,987
Interest expense, net | (14,200) | (14,472) | (42,561) | (46,538)
Non-operating pension benefit | 489 | 1,356 | 1,517 | 824
Loss on debt extinguishment | 0 | 0 | 0 | (22,990)
Consolidated income (loss) before taxes | (294,218) | 118,162 | (215,967) | 163,283
Reportable Segment |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Deferred revenue adjustments | 0 | (3,229) | 0 | (7,889)
Total Segment EBITDA | 101,428 | 125,960 | 289,386 | 353,344
Goodwill and other asset impairment | 342,146 | 0 | 342,146 | 0
Segment revenues | 620,318 | 659,003 | 1,845,023 | 1,937,867
Amortization of intangibles | (22,243) | (25,533) | (67,952) | (74,990)
Depreciation expense | (12,147) | (11,671) | (37,170) | (35,562)
Severance, restructuring, and acquisition integration costs | 4,045 | 11,688 | 10,904 | 57,010
Purchase accounting effects related to acquisitions | (186) | 821 | 1,845 | 2,359
Amortization of software development intangible assets | (1,197) | (620) | (3,206) | (1,344)
Loss on sale of assets | 0 | 0 | 0 | (94)
Litigation Settlement, Expense | 0 | (2,634) | 0 | (2,634)
Gain from patent litigation | 0 | 62,141 | 0 | 62,141
Eliminations |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Operating income (loss) | (343) | $ (627) | (1,086) | $ (1,616)
Grass Valley | Reportable Segment |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Goodwill and other asset impairment | $ 342,100 |  | $ 342,100 |

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