SEGMENT INFORMATION - Revenue Disaggregated by Service (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenue	$ 1,358,748	$ 1,764,355	$ 1,619,317
Operating Segments | International
Segment Reporting Information [Line Items]
Revenue	115,807	101,038	102,295
Domestic
Segment Reporting Information [Line Items]
Revenue	1,242,941	1,663,317	1,517,022
Domestic | Operating Segments | Ads and Leads
Segment Reporting Information [Line Items]
Revenue	1,124,908	1,282,061	1,227,074
Domestic | Operating Segments | Services
Segment Reporting Information [Line Items]
Revenue	118,033	381,256	289,948
Domestic | Consumer connection revenue | Operating Segments | Ads and Leads
Segment Reporting Information [Line Items]
Revenue	781,089	954,735	898,422
Domestic | Advertising revenue | Operating Segments | Ads and Leads
Segment Reporting Information [Line Items]
Revenue	290,799	265,466	252,206
Domestic | Membership subscription revenue | Operating Segments | Ads and Leads
Segment Reporting Information [Line Items]
Revenue	52,305	60,411	68,062
Domestic | Other revenue | Operating Segments | Ads and Leads
Segment Reporting Information [Line Items]
Revenue	715	1,449	8,384
International | Operating Segments | International
Segment Reporting Information [Line Items]
Revenue	115,807	101,038	102,295
International | Consumer connection revenue | Operating Segments | International
Segment Reporting Information [Line Items]
Revenue	92,635	71,851	68,686
International | Service professional membership subscription revenue | Operating Segments | International
Segment Reporting Information [Line Items]
Revenue	22,548	28,192	32,367
International | Advertising and other revenue | Operating Segments | International
Segment Reporting Information [Line Items]
Revenue	$ 624	$ 995	$ 1,242