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, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Revenues and Consolidated Revenues	$ 2,606,485	$ 2,301,260	$ 1,752,192
Depreciation expense	(46,700)	(43,900)	(39,300)
Amortization of intangibles	(37,860)	(30,630)	(29,041)
Severance, restructuring, and acquisition integration costs	(16,470)	(18,367)	(8,920)
Asset impairments	0	(140,461)	(113,007)
Gain on sale of asset	37,891	0	0
Consolidated operating income	363,334	263,676	150,114
Interest expense, net	(43,554)	(62,693)	(58,903)
Loss on debt extinguishment	6,392	5,715	0
Non-operating pension benefit (cost)	4,005	4,476	(395)
Gain on sale of note receivable	0	27,036	0
Consolidated income from continuing operations before taxes	317,393	226,780	90,816
Proceeds from disposal of tangible assets	$ 43,534	30,234	3,161
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
Grass Valley
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Asset impairments			(113,000)
Reportable Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Segment EBITDA	438,596	367,193	231,635
Depreciation expense	(46,669)	(43,073)	(39,339)
Amortization of intangibles	(37,860)	(30,630)	(29,041)
Severance, restructuring, and acquisition integration costs	(16,685)	(23,867)	(11,664)
Adjustments related to acquisitions and divestitures	(7,833)	5,035	(125)
Amortization of software development intangible assets	(3,875)	(1,579)	(872)
Asset impairments	0	(9,283)	0
Gain on sale of asset			0
Consolidated operating income	363,334	263,676	150,114
Interest expense, net	(43,554)
Lease guarantees	10,100
Inventory adjustment	2,200
Collection of receivable previously written off	4,500
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
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 | Opterna International Corp.
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjustments related to acquisitions and divestitures			100
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	(231)	(120)	(480)
Segment revenues | Reportable Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Segment Revenues and Consolidated Revenues	$ 2,606,485	$ 2,301,260	$ 1,752,192