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COMMITMENTS AND CONTINGENCIES - Narrative (Details) | Sep. 03, 2020 arbitration | Jul. 13, 2020 plaintiff | Jun. 13, 2019 plaintiff | Aug. 31, 2018 plaintiff | Aug. 14, 2018 USD ($) plaintiff | Dec. 31, 2020 USD ($) lawsuit
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Other Commitments [Line Items] |  |  |  |  |  |
Loss contingency reserve |  |  |  |  |  | $ 0
Number of lawsuits with possible material impact (one or more) | lawsuit |  |  |  |  |  | 1
Purchase Obligation |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Purchase obligations due in next twelve months |  |  |  |  |  | $ 54,000,000.0
Purchase obligations due between one and three years |  |  |  |  |  | 9,000,000.0
Purchase obligations due between three and five years |  |  |  |  |  | 12,000,000.0
Total purchase obligations |  |  |  |  |  | 75,000,000.0
Surety Bond |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Funding commitments |  |  |  |  |  | $ 200,000
Tinder Optionholder Litigation |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Number of plaintiffs | plaintiff |  |  | 2 | 6 | 10 |
Number of plaintiffs who filed a discontinuance of claims | plaintiff |  | 4 |  | 4 |  |
Number of arbitrations | arbitration | 4 |  |  |  |  |
Tinder Optionholder Litigation | Pending Litigation |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Damages sought |  |  |  |  | $ 2,000,000,000 |

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