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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of carrying amount of goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill [Roll Forward] |  |  |
Beginning balance | $ 512,595,000 | $ 250,568,000 |
Acquisition of other businesses |  | 262,027,000 |
Goodwill impairment | (53,100,000) | 0 | $ 0
Other | 960,000 |  |
Ending balance | 472,326,000 | 512,595,000 | 250,568,000
Capital Markets Segment |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 162,018,000 | 51,338,000 |
Acquisition of other businesses | 0 | 110,680,000 |
Goodwill impairment | 0 |  |
Other | 0 |  |
Ending balance | 162,018,000 | 162,018,000 | 51,338,000
Wealth Management Segment |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 51,195,000 | 51,195,000 |
Acquisition of other businesses | 0 | 0 |
Goodwill impairment | 0 |  |
Other | 0 |  |
Ending balance | 51,195,000 | 51,195,000 | 51,195,000
Auction and Liquidation segment: |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 1,975,000 | 1,975,000 |
Acquisition of other businesses | 0 | 0 |
Goodwill impairment | 0 |  |
Other | 0 |  |
Ending balance | 1,975,000 | 1,975,000 | 1,975,000
Financial Consulting Segment |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 23,680,000 | 23,680,000 |
Acquisition of other businesses | 9,443,000 | 0 |
Goodwill impairment | 0 |  |
Other | 187,000 |  |
Ending balance | 33,310,000 | 23,680,000 | 23,680,000
Communications Segment |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 193,195,000 | 122,380,000 |
Acquisition of other businesses | 0 | 70,815,000 |
Goodwill impairment | 0 |  |
Other | 672,000 |  |
Ending balance | 193,867,000 | 193,195,000 | 122,380,000
Consumer Products Segment |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 75,753,000 | 0 |
Acquisition of other businesses | 0 | 75,753,000 |
Goodwill impairment | (53,100,000) |  |
Other | 4,028,000 |  |
Ending balance | 26,681,000 | 75,753,000 | 0
All Other: |  |  |
Goodwill [Roll Forward] |  |  |
Beginning balance | 4,779,000 | 0 |
Acquisition of other businesses | 2,428,000 | 4,779,000 |
Goodwill impairment | 0 |  |
Other | (3,927,000) |  |
Ending balance | $ 3,280,000 | $ 4,779,000 | $ 0

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