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LONG-TERM DEBT - Summary (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Feb. 11, 2020 | Dec. 31, 2019 | Feb. 15, 2019 | Dec. 04, 2017 | Jun. 01, 2016
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Less: unamortized original issue discount | $ 347,306 |  |  |  |  |
Less: current portion of ANGI Term Loan | 13,750 |  | $ 13,750 |  |  |
Less: unamortized debt issuance costs | 50,499 |  |  |  |  |
Long-term debt, net | 3,625,008 |  | 3,121,572 |  |  |
Match Group |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | 2,125,000 |  | 1,625,000 |  |  |
Less: unamortized original issue discount | 6,618 |  | 6,282 |  |  |
Less: unamortized debt issuance costs | 20,428 |  | 15,235 |  |  |
Long-term debt, net | 2,097,954 |  | 1,603,483 |  |  |
Match Group | Term Loan | MTCH Term Loan due February 13, 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | 425,000 |  | 425,000 |  |  |
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 |  |  |
Stated interest rate (as a percent) | 5.625% |  |  | 5.625% |  |
Match Group | Senior Notes | 4.125% MTCH Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | $ 500,000 |  | 0 |  |  |
Stated interest rate (as a percent) | 4.125% | 4.125% |  |  |  |
ANGI Homeservices |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Less: current portion of ANGI Term Loan | $ 13,750 |  | 13,750 |  |  |
Less: unamortized debt issuance costs | 1,670 |  | 1,804 |  |  |
Long-term debt, net | 228,643 |  | 231,946 |  |  |
ANGI Homeservices | Term Loan | ANGI Term Loan due November 5, 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | 244,063 |  | 247,500 |  |  |
IAC |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | 1,667,500 |  | 1,667,500 |  |  |
Less: unamortized original issue discount | 340,688 |  | 351,605 |  |  |
Less: unamortized debt issuance costs | 28,401 |  | 29,752 |  |  |
Long-term debt, net | 1,298,411 |  | 1,286,143 |  |  |
IAC | Senior Notes | 2022 Exchangeable Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | 517,500 |  | 517,500 |  |  |
Less: unamortized original issue discount | $ 37,314 |  | 40,768 |  |  |
Stated interest rate (as a percent) | 0.875% |  |  |  |  |
IAC | Senior Notes | 2026 Exchangeable Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | $ 575,000 |  | 575,000 |  |  |
Less: unamortized original issue discount | $ 124,820 |  | 129,037 |  |  |
Stated interest rate (as a percent) | 0.875% |  |  |  |  |
IAC | Senior Notes | 2030 Exchangeable Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | $ 575,000 |  | 575,000 |  |  |
Less: unamortized original issue discount | $ 178,554 |  | $ 181,800 |  |  |
Stated interest rate (as a percent) | 2.00% |  |  |  |  |

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