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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