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Segment Information (Reconciliation of Total Segment Operating Income to Consolidated Operating Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 320,800 | $ 326,016 | $ 635,285 | $ 633,158
Total operating costs and expenses | 292,231 | 287,121 | 570,855 | 567,948
Income from operations | 28,569 | 38,895 | 64,430 | 65,210
Reportable segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 320,800 | 326,016 | 635,285 | 633,158
Total operating costs and expenses | 274,234 | 275,783 | 537,705 | 542,853
Income from operations | 46,566 | 50,233 | 97,580 | 90,305
Elimination of inter-segment revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | (1) | (50) | (20) | (135)
Total operating costs and expenses | (1) | (50) | (20) | (135)
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 0 | 0 | 0
Total operating costs and expenses | 17,997 | 11,338 | 33,150 | 25,095
Income from operations | (17,997) | (11,338) | (33,150) | (25,095)
Digital Media | Reportable segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 251,817 | 252,870 | 490,869 | 487,081
Total operating costs and expenses | 216,798 | 216,154 | 424,245 | 421,896
Income from operations | 35,019 | 36,716 | 66,624 | 65,185
Cybersecurity and Martech | Reportable segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 68,984 | 73,196 | 144,436 | 146,212
Total operating costs and expenses | 57,437 | 59,679 | 113,480 | 121,092
Income from operations | $ 11,547 | $ 13,517 | $ 30,956 | $ 25,120

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