Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Dispositions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Dispositions - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) gain on sale of businesses	$ (24,600)	$ 17,122	$ (21,798)	$ 17,122
Goodwill impairment on business	$ 0	$ 0	32,629	$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Voice Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) gain on sale of businesses			2,800
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| B2B Backup Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) gain on sale of businesses			24,600
Goodwill impairment on business			$ 32,600