Disposals - Operating Results of the Disposal Group (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairments	$ 0	$ (140,461)	$ (113,007)
Tripwire | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	12,067	106,840	110,524
Cost of sales	(3,256)	(24,321)	(22,857)
Gross profit	8,811	82,519	87,667
Selling, general and administrative expenses	(8,185)	(48,308)	(42,741)
Research and development expenses	(5,528)	(34,433)	(34,276)
Amortization of intangible assets	(638)	(7,716)	(35,354)
Asset impairments	0	(131,178)	0
Loss before taxes	$ (5,540)	$ (139,116)	(24,704)
Grass Valley
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairments			(113,000)
Grass Valley | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues			109,195
Cost of sales			(70,199)
Gross profit			38,996
Selling, general and administrative expenses			(39,947)
Research and development expenses			(15,083)
Asset impairments			(113,007)
Interest expense, net			(432)
Non-operating pension cost			(169)
Loss before taxes			$ (129,642)