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Operating Segments and Geographic Information - Reconciliation of Total Reportable Segments' Revenues and EBITDA to Consolidated Revenues and Consolidated Income Before Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Total Segment Revenues | $ 1,862,716 | $ 2,131,278 | $ 2,165,702
Amortization of intangibles | (64,395) | (74,609) | (75,140)
Depreciation expense | (42,500) | (40,400) | (38,300)
Severance, restructuring, and acquisition integration costs | (12,258) | (26,544) | (22,625)
Gain from patent litigation | 0 | 0 | 62,141
Operating income | 125,410 | 207,207 | 314,008
Interest expense, net | (58,888) | (55,814) | (60,839)
Non-operating pension benefit (cost) | (395) | 1,017 | (99)
Loss on debt extinguishment | 0 | 0 | (22,990)
Consolidated income from continuing operations before taxes | 66,127 | 152,410 | 230,080
Reportable Segment |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Total Segment Revenues | 1,862,716 | 2,131,278 | 2,165,702
Deferred revenue adjustments | 0 | 0 | 0
Total Segment EBITDA | 246,959 | 353,035 | 394,660
Amortization of intangibles | (64,395) | (74,609) | (75,140)
Depreciation expense | (42,470) | (40,409) | (38,309)
Severance, restructuring, and acquisition integration costs | (12,258) | (26,544) | (22,625)
Purchase accounting effects related to acquisitions | (125) | (592) | (1,690)
Amortization of software development intangible assets | (1,821) | (525) | (79)
Loss on sale of assets | 0 | 0 | (94)
Costs related to patent litigation | 0 | 0 | (2,634)
Gain from patent litigation | 0 | 0 | 62,141
Operating income | 125,410 | 207,207 | 314,008
Interest expense, net | (58,888) | (55,814) | (60,839)
Eliminations |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Operating income | (480) | (3,149) | (2,222)
Segment revenues | Reportable Segment |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Total Segment Revenues | $ 1,862,716 | $ 2,131,278 | $ 2,165,702

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