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Operating Segments - Reconciliation of Total Reportable Segments' Revenues and EBITDA to Consolidated Revenues and Consolidated Income Before Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Apr. 01, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Segment revenues | $ 587,175 | $ 605,565
Amortization of intangibles | (23,341) | (24,418)
Depreciation expense | (12,700) | (11,900)
Severance, restructuring, and acquisition integration costs | (3,775) | (20,394)
Operating income | 44,445 | 44,203
Interest expense, net | (14,193) | (16,978)
Non-operating pension benefit (cost) | 547 | (275)
Loss on debt extinguishment | 0 | (19,960)
Consolidated income before taxes | 30,799 | 6,990
Reportable Segment |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Segment revenues | 587,175 | 607,423
Deferred revenue adjustments | 0 | (1,858)
Total Segment EBITDA | 87,017 | 103,878
Amortization of intangibles | (23,341) | (24,418)
Depreciation expense | (12,723) | (11,865)
Severance, restructuring, and acquisition integration costs | (3,775) | (20,394)
Purchase accounting effects related to acquisitions | (1,313) | (502)
Amortization of software development intangible assets | (937) | (236)
Loss on sale of assets | 0 | (94)
Eliminations |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Operating income | (483) | (308)
Snell Advanced Media |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Amortization of intangibles |  | $ (2,200)
Earnout accrued expense recognized within selling, general and administrative expense | $ 1,300 |

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