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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Narrative (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Oct. 19, 2018 | Oct. 10, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Interest income | $ 1,700 | $ 8,000 | $ 4,800 |  |
Other expense | 500 |  |  |  |
Mark-to-market loss related for an indemnification claim related to the Handy acquisition |  | 1,800 |  |  |
Gain from the sale of a business | $ (273) | (218) | 13,237 |  |
Other Nonoperating Income (Expense) |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Foreign currency exchange gain (loss) |  | $ 600 |  |  |
Class A Common Stock |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Common stock issued (shares) | 94,238 | 87,007 |  |  |
Common stock | $ 94 | $ 87 |  |  |
Class B Common Stock |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Common stock issued (shares) | 421,862 | 421,570 |  |  |
Common stock | $ 422 | $ 422 |  |  |
Angie's List Transaction Agreement | ANGI Homeservices | Class B Common Stock |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Common stock issued (shares) |  |  |  |  | 5,100
Handy |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Common stock issued (shares) |  |  |  | 8,600 |
Common stock |  |  |  | $ 165,800 |
Handy | ANGI Homeservices | Class A Common Stock |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Common stock issued (shares) |  |  |  | 8,600 |
Common stock |  |  |  | $ 165,800 |
Felix |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Gain from the sale of a business |  |  | $ 13,200 |  |

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