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Segment Information - Reconciliation of Total Segment Operating Income to Consolidated Operating Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 1,364,028 | $ 1,390,997 | $ 1,416,722
Total operating costs and expenses | 1,231,417 | 1,192,056 | 1,249,382
Income from operations | 132,611 | 198,941 | 167,340
Reportable segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating costs and expenses | 1,179,979 | 1,141,865 | 1,189,082
Income from operations | 184,049 | 249,132 | 227,640
Elimination of inter-segment revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | (152) | (801) | (1,189)
Total operating costs and expenses | (152) | (801) | (1,189)
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Total operating costs and expenses | 51,438 | 50,191 | 60,300
Income from operations | (51,438) | (50,191) | (60,300)
Digital Media | Reportable segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 1,072,971 | 1,079,172 | 1,069,300
Total operating costs and expenses | 931,980 | 880,240 | 851,807
Income from operations | 140,991 | 198,932 | 217,493
Digital Media | Elimination of inter-segment revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 200 | 800 | 800
Cybersecurity and Martech | Reportable segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | 291,209 | 312,626 | 348,611
Total operating costs and expenses | 248,151 | 262,426 | 338,464
Income from operations | 43,058 | 50,200 | 10,147
Cybersecurity and Martech | Reportable segments | Revision of Prior Period, Adjustment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total operating costs and expenses |  |  | 19,200
Cybersecurity and Martech | Elimination of inter-segment revenues |  |  |
Segment Reporting Information [Line Items] |  |  |
Total revenues | $ 0 | $ 0 | $ 400

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