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Goodwill and Intangible Assets (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
reporting_unit
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
reporting_unit
Dec. 31, 2024
USD ($)
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment   $ 85,273 $ 17,579 $ 85,273  
Amortization of intangible assets $ 31,300 28,500 90,700 82,500  
Operating Segments          
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment 17,579   17,579 85,273  
Technology & Shopping          
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment   $ 85,300   $ 85,300  
Number of reporting units | reporting_unit   2   2  
Goodwill accumulated impairment loss 169,500   169,500   $ 169,500
Technology & Shopping | Operating Segments          
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment 0   0 $ 85,273  
Cybersecurity & Martech          
Finite-Lived Intangible Assets [Line Items]          
Goodwill accumulated impairment loss 17,600   17,600    
Cybersecurity & Martech | Operating Segments          
Finite-Lived Intangible Assets [Line Items]          
Goodwill impairment $ 17,579   $ 17,579 $ 0