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GOODWILL AND INTANGIBLE ASSETS - Goodwill and Intangible Assets (Details) |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 segment | Oct. 31, 2018 USD ($) segment | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 10, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 11, 2018 USD ($)
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 903,227,000 | $ 903,227,000 |  | $ 831,435,000 |
Accumulated impairment losses |  |  |  |  | (483,088,000) | (483,088,000) |  | (483,088,000) |
Net Goodwill |  |  | $ 420,139,000 | $ 348,347,000 | 420,139,000 | 420,139,000 |  | $ 348,347,000 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |
Net goodwill, beginning balance |  |  | 420,139,000 | 348,347,000 |  |  |  |  |
Changes in goodwill |  |  | 0 |  |  |  |  |  |
Net goodwill, ending balance |  |  | $ 420,139,000 | 420,139,000 |  |  |  |  |
Intangible Assets |  |  |  |  |  |  |  |  |
Intangible assets with indefinite lives |  |  |  |  | 10,142,000 | 10,142,000 |  |  |
Intangible assets with definite lives, net |  |  |  |  | 118,360,000 | 171,438,000 |  |  |
Total intangible assets, net |  |  |  |  | 128,502,000 | $ 181,580,000 |  |  |
Number of reportable segments | segment | 1 | 1 | 3 |  |  |  |  |  |
Impairment losses during period related to goodwill |  |  | $ 0 |  |  |  |  |  |
Impairment charges related to trade names and trademarks |  |  | $ 0 |  |  |  |  |  |
Ovation |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Net Goodwill |  |  |  |  |  |  |  |  | $ 11,280,000
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |
Acquisition of business |  |  |  | 20,000 |  |  |  |  |
QuoteWizard |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Net Goodwill |  | $ 182,896,000 |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |
Acquisition of business |  |  |  | 33,000 |  |  |  |  |
Net goodwill, ending balance |  | $ 182,896,000 |  |  |  |  |  |  |
ValuePenguin |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Net Goodwill |  |  |  |  |  |  | $ 71,739,000 |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |
Acquisition of business |  |  |  | $ 71,739,000 |  |  |  |  |
Home |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 59,300,000 |  |  |  |
Consumer |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 166,100,000 |  |  |  |
Insurance |  |  |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 194,700,000 |  |  |  |

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