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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Segment Revenues and Consolidated Revenues | $ 2,512,084 | $ 2,606,485 | $ 2,301,260
Depreciation expense | (51,400) | (46,700) | (43,900)
Amortization of intangibles | (40,375) | (37,860) | (30,630)
Severance, restructuring, and acquisition integration costs | (18,654) | (16,470) | (18,367)
Asset impairments | 0 | 0 | (140,461)
Gain on sale of assets | 12,056 | 37,891 | 0
Consolidated operating income | 317,518 | 363,334 | 263,676
Interest expense, net | (33,625) | (43,554) | (62,693)
Loss on debt extinguishment | 0 | (6,392) | (5,715)
Non-operating pension benefit | 1,863 | 4,005 | 4,476
Gain on sale of note receivable | 0 | 0 | 27,036
Consolidated income from continuing operations before taxes | 285,756 | 317,393 | 226,780
Gain (loss) associated with sale of businesses | 12,056 | 37,891 | 0
Proceeds from disposal of tangible assets | 13,785 | 43,534 | $ 30,234
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Asset impairments
Proceeds from sale of real estate |  | 42,200 |
Gain on sale of real estate |  | 37,900 |
Reportable Segment |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Segment Revenues and Consolidated Revenues | 2,512,084 | 2,606,485 | $ 2,301,260
Total Segment EBITDA | 436,435 | 438,596 | 367,193
Depreciation expense | (51,379) | (46,669) | (43,073)
Amortization of intangibles | (40,375) | (37,860) | (30,630)
Severance, restructuring, and acquisition integration costs | (25,152) | (16,685) | (23,867)
Amortization of software development intangible assets | (7,692) | (3,875) | (1,579)
Adjustments related to acquisitions and divestitures | (6,177) | (7,833) | 5,035
Asset impairments | 0 | 0 | (9,283)
Gain on sale of assets | 12,056 | 37,891 | 0
Lease guarantees | 4,100 | 10,100 |
Inventory adjustment | 1,500 | 2,200 |
Gain (loss) associated with sale of businesses | (600) |  |
Collection of receivable previously written off |  | 4,500 |
Increase (decrease) in deferred compensation earnout payments |  |  | (5,800)
Proceeds from disposal of tangible assets |  |  | 600
Impairment of long lived asset held-for-use |  |  | 3,600
Asset impairments |  |  | 5,700
Proceeds from sale of real estate | 13,800 | 42,200 |
Gain on sale of real estate | 12,100 | 37,900 |
Reportable Segment | OTN Systems |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Adjustments related to acquisitions and divestitures |  |  | 2,300
Reportable Segment | Grass Valley |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Recovery of accounts receivable previously written off |  |  | 2,200
Eliminations |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Consolidated operating income | $ (198) | $ (231) | $ (120)

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