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Discontinued Operations and Dispositions - Key Components of Income From Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 07, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of income taxes	$ (23,106)	$ 40,520	$ 38,762	$ 39,143	$ 16,126	$ 46,756	$ 36,436	$ 22,690	$ 95,319	$ 122,008	$ 177,913
6.0% Senior Notes | Senior Notes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Stated interest rate												6.00%
Discontinued Operations | J2 Global
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues									270,248	330,764	321,590
Cost of revenues									(44,306)	(53,379)	(49,991)
Sales and marketing									(40,980)	(47,116)	(51,522)
Research, development and engineering									(5,814)	(7,146)	(9,745)
General and administrative									(39,279)	(26,852)	(21,475)
Interest expense and other									(13,856)	(44,220)	(44,080)
Income before income taxes									126,013	152,051	144,777
Income tax expense (benefit)									30,694	30,043	(33,136)
Income from discontinued operations, net of income taxes									$ 95,319	$ 122,008	$ 177,913

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