Accrued Liabilities - Severance Payments, Covid (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	$ 4,822	$ 11,508
COVID-19 Related
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	120	4,925
YP Integration Related
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	0	3,377
Other
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	$ 4,702	$ 3,206

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3367-108585

Name:	us-gaap_PaymentsForRestructuring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration