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GOODWILL AND OTHER INTANGIBLE ASSETS - Additional information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Goodwill [Line Items]      
Goodwill $ 392,687   $ 392,687
Amortization expense 6,252 $ 7,642  
Estimated future amortization expense remainder of fiscal year 18,305    
Estimated future amortization expense year one 23,272    
Estimated future amortization expense year two 20,096    
Estimated future amortization expense year three 15,470    
Estimated future amortization expense year four 11,167    
Estimated future amortization expense after year four 9,128    
Indefinite-Lived Intangible Assets      
Goodwill [Line Items]      
Asset impairment charges 22,000    
Operating Segments      
Goodwill [Line Items]      
Goodwill, impairment loss 137,445    
Operating Segments | Capital Markets segment      
Goodwill [Line Items]      
Goodwill 158,834    
Operating Segments | Wealth Management      
Goodwill [Line Items]      
Goodwill 37,334    
Operating Segments | Lingo      
Goodwill [Line Items]      
Goodwill 71,551    
Operating Segments | magicJack      
Goodwill [Line Items]      
Goodwill 106,461    
Operating Segments | Marconi Wireless      
Goodwill [Line Items]      
Goodwill 128    
Operating Segments | UOL      
Goodwill [Line Items]      
Goodwill 15,727    
Operating Segments | Consumer Products      
Goodwill [Line Items]      
Goodwill, impairment loss 79,781    
Corporate & All Other      
Goodwill [Line Items]      
Goodwill 2,652    
Goodwill, impairment loss $ 57,664