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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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