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Revenues (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Total revenues $ 315,068 $ 311,657
Point in time    
Disaggregation of Revenue [Line Items]    
Total revenues 8,983 5,965
Over time    
Disaggregation of Revenue [Line Items]    
Total revenues 306,085 305,692
Advertising | Revision of Prior Period, Reclassification, Adjustment | Revenue Correction, Subscription And Licensing To Advertising    
Disaggregation of Revenue [Line Items]    
Total revenues   3,200
Subscription | Revision of Prior Period, Reclassification, Adjustment | Revenue Correction, Subscription And Licensing To Advertising    
Disaggregation of Revenue [Line Items]    
Total revenues   3,200
Subscription | Revision of Prior Period, Reclassification, Adjustment | Revenue Correction, Subscription And Licensing To Other    
Disaggregation of Revenue [Line Items]    
Total revenues   2,100
Other | Revision of Prior Period, Reclassification, Adjustment | Revenue Correction, Subscription And Licensing To Other    
Disaggregation of Revenue [Line Items]    
Total revenues   2,100
Operating Segments    
Disaggregation of Revenue [Line Items]    
Total revenues 315,068 311,657
Operating Segments | Digital Media    
Disaggregation of Revenue [Line Items]    
Total revenues 234,827 226,874
Operating Segments | Cybersecurity and Martech    
Disaggregation of Revenue [Line Items]    
Total revenues 80,494 84,901
Operating Segments | Advertising | Digital Media    
Disaggregation of Revenue [Line Items]    
Total revenues 170,067 177,288
Operating Segments | Subscription | Digital Media    
Disaggregation of Revenue [Line Items]    
Total revenues 55,576 45,625
Operating Segments | Subscription | Cybersecurity and Martech    
Disaggregation of Revenue [Line Items]    
Total revenues 80,494 84,901
Operating Segments | Other | Digital Media    
Disaggregation of Revenue [Line Items]    
Total revenues 9,184 3,961
Operating Segments | Other | Cybersecurity and Martech    
Disaggregation of Revenue [Line Items]    
Total revenues 0 0
Corporate    
Disaggregation of Revenue [Line Items]    
Total revenues 0 0
Elimination of inter-segment revenues    
Disaggregation of Revenue [Line Items]    
Total revenues $ (253) $ (118)