SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total Direct Revenue	$ 2,983,277	$ 2,391,269	$ 2,051,258
Direct Revenue
Disaggregation of Revenue [Line Items]
Total Direct Revenue	2,922,871	2,344,724	2,007,174
Direct Revenue | Tinder
Disaggregation of Revenue [Line Items]
Total Direct Revenue	1,649,757	1,355,400	1,152,045
Direct Revenue | Other brands
Disaggregation of Revenue [Line Items]
Total Direct Revenue	1,273,114	989,324	855,129
Indirect Revenue (principally advertising revenue)
Disaggregation of Revenue [Line Items]
Total Direct Revenue	60,406	46,545	44,084
Americas | Direct Revenue
Disaggregation of Revenue [Line Items]
Total Direct Revenue	1,512,057	1,247,961	1,090,158
Europe | Direct Revenue
Disaggregation of Revenue [Line Items]
Total Direct Revenue	821,827	680,128	584,412
APAC and Other | Direct Revenue
Disaggregation of Revenue [Line Items]
Total Direct Revenue	$ 588,987	$ 416,635	$ 332,604