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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