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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment | $ 211,973 |  | $ 0 | $ 3,318 |
Goodwill | 3,042,139 | $ 2,854,462 |  | 2,854,462 | $ 2,726,859
Carrying amount of goodwill for which excess of fair value over carrying value is less than 10% | $ 709,400 |  |  |  |
Discount Rate | Maximum | Trade names |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Measurement input (as a percent) | 0.150 |  |  |  |
Discount Rate | Minimum | Trade names |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Measurement input (as a percent) | 0.105 |  |  |  |
Royalty Rate | Maximum | Trade names |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Measurement input (as a percent) | 0.060 |  |  |  |
Royalty Rate | Minimum | Trade names |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Measurement input (as a percent) | 0.010 |  |  |  |
Match Group |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Impairment of indefinite-lived intangible assets | $ 4,600 |  |  |  |
Publishing |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment on goodwill | 399,700 | 399,700 |  | 399,700 |
Applications |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment | 211,973 |  |  | 0 |
Goodwill | 292,641 | 504,748 |  | 504,748 | 504,892
Accumulated impairment on goodwill | 741,100 | 529,100 |  | 529,100 |
Emerging & Other |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment |  |  |  | 3,318 |
Goodwill | 425,246 | 8,449 |  | 8,449 | 7,002
Dotdash |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Accumulated impairment on goodwill | 198,300 | 198,300 |  | 198,300 |
Desktop | Applications |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment | 211,973 |  |  | 0 |
Impairment of indefinite-lived intangible assets | 21,400 |  |  |  |
Goodwill | $ 53,173 | 265,146 |  | 265,146 | 265,146
Desktop | Applications | Discount Rate |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Measurement input (as a percent) | 0.150 |  |  |  |
Mosaic Group | Applications |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment | $ 0 |  |  | 0 |
Goodwill | 239,468 | 239,602 |  | 239,602 | $ 239,746
College Humor Media | Emerging & Other |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment | 0 | 3,300 |  |  |
Accumulated impairment on goodwill | $ 14,900 | $ 14,900 |  | $ 14,900 |

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