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Operating Segments - Reconciliation of Total Reportable Segments' Revenues and EBITDA to Consolidated Revenues and Consolidated Income from Continuing Operations Before Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Consolidated Revenues | $ 655,774 | $ 621,745 | $ 1,929,978 | $ 1,783,759
Gain from patent litigation | (62,141) | 0 | (62,141) | 0
Amortization of intangibles | (25,533) | (27,162) | (74,990) | (77,944)
Severance, restructuring, and acquisition integration costs | (11,688) | (16,679) | (57,010) | (32,839)
Depreciation expense | (11,700) | (11,700) | (35,600) | (34,600)
Operating income | 131,278 | 61,116 | 231,987 | 175,489
Interest expense, net | (14,472) | (19,385) | (46,538) | (66,424)
Non-operating pension benefit (cost) | 1,356 | (325) | 824 | (880)
Loss on debt extinguishment | 0 | (51,594) | (22,990) | (52,441)
Income before taxes | 118,162 | (10,188) | 163,283 | 55,744
Reportable Segment |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Total Segment Revenues | 659,003 | 621,745 | 1,937,867 | 1,783,759
Deferred revenue adjustments | (3,229) | 0 | (7,889) | 0
Consolidated Revenues | 655,774 | 621,745 | 1,929,978 | 1,783,759
Total Segment EBITDA | 125,960 | 117,856 | 353,344 | 321,748
Gain from patent litigation | 62,141 | 0 | 62,141 | 0
Costs related to patent litigation | (2,634) | 0 | (2,634) | 0
Amortization of intangibles | (25,533) | (27,162) | (74,990) | (77,944)
Severance, restructuring, and acquisition integration costs | (11,688) | (16,679) | (57,010) | (32,839)
Depreciation expense | (11,671) | (11,683) | (35,562) | (34,594)
Purchase accounting effects related to acquisitions | (821) | (2,922) | (2,359) | (4,089)
Amortization of software development intangible assets | (620) | 0 | (1,344) | 0
Loss on sale of assets | 0 | 0 | (94) | 0
Income from equity method investment | 0 | 2,551 | 0 | 5,835
Eliminations |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Operating income | $ (627) | $ (845) | $ (1,616) | $ (2,628)

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