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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Oct. 18, 2022
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 472,326 | $ 512,595 | $ 250,568 |
Acquisition of other businesses |  |  |  | 262,027 |  |
Other |  |  | 960 |  |  |
Amortization expense |  |  | 40,136 | 34,292 | 22,006 |
Estimated future amortization expense next 12 months |  |  | 33,970 |  |  |
Estimated future amortization expense, year one |  |  | 30,336 |  |  |
Estimated future amortization expense, year two |  |  | 27,208 |  |  |
Estimated future amortization expense, year three |  |  | 24,842 |  |  |
Estimated future amortization expense, year four |  |  | 21,162 |  |  |
Estimated future amortization expense, after year four |  |  | 39,721 |  |  |
Impairment of goodwill and tradenames |  | $ 35,500 | 70,333 | 0 | 0 |
Impairment of intangible assets | $ 1,733 |  |  | 4,174 | 0 |
Goodwill, fair value disclosure |  |  | 26,681 |  |  |
Tradename, fair value disclosure |  |  | 19,500 |  |  |
Fair value measurement, growth rate |  | 4.00% |  |  |  |
Fair value measurement, discount rate |  | 21.00% |  |  |  |
Fair value measurement, royalty rate |  | 2.00% |  |  |  |
Targus |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 79,781
Asset impairment charges |  |  | 68,600 |  |  |
Acquisition of other businesses |  |  | 11,871 |  |  |
Goodwill, purchase accounting adjustments |  |  | 4,028 |  |  |
Financial Consulting Segment |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  |  | 33,310 | 23,680 | 23,680 |
Acquisition of other businesses |  |  | 9,443 | 0 |  |
Other |  |  | 187 |  |  |
Communications Segment |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  |  | 193,867 | 193,195 | 122,380 |
Acquisition of other businesses |  |  | 0 | 70,815 |  |
Other |  |  | 672 |  |  |
All Other: |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill |  |  | 3,280 | 4,779 | 0 |
Acquisition of other businesses |  |  | 2,428 | 4,779 |  |
Other |  |  | (3,927) |  |  |
Goodwill |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Asset impairment charges |  | $ 27,500 | 25,600 |  |  |
Goodwill | Targus |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Asset impairment charges |  |  | 53,100 |  |  |
Indefinite-Lived Intangible Assets |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Asset impairment charges |  | $ 8,000 | 7,500 | $ 0 | $ 0 |
Indefinite-Lived Intangible Assets | Targus |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Asset impairment charges |  |  | $ 15,500 |  |  |

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