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Segment Information (Reconciliation of Total Segment Operating Income to Consolidated Operating Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Total revenues | $ 314,485 | $ 307,142
Total operating costs and expenses | 278,624 | 280,827
Income from operations | 35,861 | 26,315
Reportable segments |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 314,485 | 307,142
Total operating costs and expenses | 263,471 | 267,070
Income from operations | 51,014 | 40,072
Elimination of inter-segment revenues |  |
Segment Reporting Information [Line Items] |  |
Total revenues | (19) | (85)
Total operating costs and expenses | (19) | (85)
Corporate |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 0 | 0
Total operating costs and expenses | 15,153 | 13,757
Income from operations | (15,153) | (13,757)
Digital Media | Reportable segments |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 239,052 | 234,211
Total operating costs and expenses | 207,447 | 205,742
Income from operations | 31,605 | 28,469
Cybersecurity and Martech | Reportable segments |  |
Segment Reporting Information [Line Items] |  |
Total revenues | 75,452 | 73,016
Total operating costs and expenses | 56,043 | 61,413
Income from operations | $ 19,409 | $ 11,603

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