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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
--- | --- | ---
Oct. 03, 2021 | Sep. 27, 2020 | Oct. 03, 2021 | Sep. 27, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Segment revenues | $ 630,835 | $ 475,839 | $ 1,769,190 | $ 1,364,176
Amortization of Intangible Assets | (9,696) | (16,104) | (28,745) | (48,306)
Depreciation expense | (11,300) | (10,500) | (34,200) | (31,100)
Severance, restructuring, and acquisition integration costs | (4,328) | (1,357) | (12,539) | (9,448)
Operating income | 71,166 | 36,127 | 188,571 | 82,965
Interest expense, net | (16,251) | (15,607) | (46,640) | (43,188)
Loss on debt extinguishment | (5,715) | 0 | (5,715) | 0
Total non-operating pension benefit | 992 | 680 | 3,121 | 2,079
Consolidated income from continuing operations before taxes | 50,192 | 21,200 | 139,337 | 41,856
Impairment of assets to be held for sale | 2,300 |  |  |
OTN Systems N.V. |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Amortization of Intangible Assets | (1,400) |  | (3,700) |
Inventory adjustment | 400 |  | 2,400 |
Reportable Segment |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Segment revenues | 631,338 | 475,839 | 1,770,542 | 1,364,176
Adjustments related to acquisitions | (503) | 0 | (1,352) | 0
Total Segment EBITDA | 99,738 | 64,641 | 271,207 | 173,560
Amortization of Intangible Assets | (9,696) | (16,104) | (28,745) | (48,306)
Depreciation expense | (11,270) | (10,455) | (34,197) | (31,069)
Severance, restructuring, and acquisition integration costs | (4,328) | (1,357) | (12,539) | (9,448)
Amortization of software development intangible assets | (790) | (529) | (2,086) | (1,245)
Purchase accounting effects related to acquisitions | (2,464) | 0 | (4,997) | (125)
Impairment of assets to be held for sale | 2,300 |  | 5,700 |
Collection of receivables, previously written off | 700 |  | 2,200 |
Impairment of assets held-for-use |  |  | 3,600 |
Reportable Segment | Opterna International Corp. |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Business combination, increase (decrease) in earn-out liability |  |  | (5,800) |
Reportable Segment | OTN Systems N.V. |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Deferred revenue adjustment | 500 |  | 1,300 |
Inventory adjustment | 400 |  | 2,400 |
Intersegment Eliminations |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Segment Elimination | $ (24) | $ (69) | $ (72) | $ (402)

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