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Revenues (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Total revenues $ 337,356 $ 341,293 $ 652,424 $ 652,950
Point in time        
Disaggregation of Revenue [Line Items]        
Total revenues 9,202 11,097 18,185 17,062
Over time        
Disaggregation of Revenue [Line Items]        
Total revenues 328,154 330,196 634,239 635,888
Advertising | Revision of Prior Period, Reclassification, Adjustment | Revenue Correction, Subscription And Licensing To Advertising        
Disaggregation of Revenue [Line Items]        
Total revenues   1,500   4,700
Subscription | Revision of Prior Period, Reclassification, Adjustment | Revenue Correction, Subscription And Licensing To Advertising        
Disaggregation of Revenue [Line Items]        
Total revenues   1,500   4,700
Subscription | Revision of Prior Period, Reclassification, Adjustment | Revenue Correction, Subscription And Licensing To Other        
Disaggregation of Revenue [Line Items]        
Total revenues   4,400   6,500
Other | Revision of Prior Period, Reclassification, Adjustment | Revenue Correction, Subscription And Licensing To Other        
Disaggregation of Revenue [Line Items]        
Total revenues   4,400   6,500
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total revenues 337,356 341,293 652,424 652,950
Operating Segments | Digital Media        
Disaggregation of Revenue [Line Items]        
Total revenues 258,700 253,977 493,527 480,850
Operating Segments | Cybersecurity and Martech        
Disaggregation of Revenue [Line Items]        
Total revenues 78,910 87,608 159,404 172,510
Operating Segments | Advertising | Digital Media        
Disaggregation of Revenue [Line Items]        
Total revenues 189,198 198,385 359,265 375,673
Operating Segments | Subscription | Digital Media        
Disaggregation of Revenue [Line Items]        
Total revenues 58,901 48,299 114,477 93,924
Operating Segments | Subscription | Cybersecurity and Martech        
Disaggregation of Revenue [Line Items]        
Total revenues 78,910 87,608 159,404 172,510
Operating Segments | Other | Digital Media        
Disaggregation of Revenue [Line Items]        
Total revenues 10,601 7,293 19,785 11,253
Elimination of inter-segment revenues        
Disaggregation of Revenue [Line Items]        
Total revenues $ (254) $ (292) $ (507) $ (410)