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LONG-TERM DEBT - Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Feb. 15, 2019	Dec. 31, 2018	Dec. 04, 2017	Jun. 01, 2016
Debt Instrument [Line Items]
Less: unamortized original issue discount	$ (368,976)
Less: current portion of ANGI Term Loan	13,750		$ 13,750
Less: unamortized debt issuance costs	48,830
Long-term debt, net	3,111,882		2,245,548
Match Group
Debt Instrument [Line Items]
Aggregate principal amount	1,625,000		1,535,000
Less: unamortized original issue discount	6,586		7,352
Less: unamortized debt issuance costs	15,786		11,737
Long-term debt, net	1,602,628		1,515,911
Match Group | Term Loan | MTCH Term Loan due November 16, 2022
Debt Instrument [Line Items]
Aggregate principal amount	425,000		425,000
Match Group | Credit Facility | MTCH Credit Facility due December 7, 2023
Debt Instrument [Line Items]
Aggregate principal amount	0		260,000
Match Group | Senior Notes | 6.375% MTCH Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 400,000		400,000
Stated interest rate (as a percent)	6.375%				6.375%
Match Group | Senior Notes | 5.00% MTCH Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 450,000		450,000
Stated interest rate (as a percent)	5.00%			5.00%
Match Group | Senior Notes | 5.625% MTCH Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 350,000	$ 350,000	0
Stated interest rate (as a percent)	5.625%	5.625%
ANGI Homeservices
Debt Instrument [Line Items]
Less: current portion of ANGI Term Loan	$ 13,750		13,750
Less: unamortized debt issuance costs	1,942		2,529
Long-term debt, net	235,246		244,971
ANGI Homeservices | Term Loan | ANGI Term Loan due November 5, 2023
Debt Instrument [Line Items]
Aggregate principal amount	250,938		261,250
IAC
Debt Instrument [Line Items]
Aggregate principal amount	1,667,500		551,989
Less: unamortized original issue discount	362,390		54,025
Less: unamortized debt issuance costs	31,102		13,298
Long-term debt, net	1,274,008		484,666
IAC | Senior Notes | 2022 Exchangeable Notes
Debt Instrument [Line Items]
Aggregate principal amount	517,500		517,500
Less: unamortized original issue discount	$ 44,259		54,025
Stated interest rate (as a percent)	0.875%
IAC | Senior Notes | 2026 Exchangeable Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 575,000		0
Less: unamortized original issue discount	$ 133,188
Stated interest rate (as a percent)	0.875%
IAC | Senior Notes | 2030 Exchangeable Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 575,000		0
Less: unamortized original issue discount	$ 184,943
Stated interest rate (as a percent)	2.00%
IAC | Senior Notes | 4.75% Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 0		$ 34,489
Stated interest rate (as a percent)	4.75%		4.75%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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