Segment Information - Total Capital Expenditures, Depreciation and Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	$ 106,154	$ 113,740	$ 92,552
Total depreciation and amortization	233,400	258,303	228,737
Reportable segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	106,143	98,488	76,315
Total depreciation and amortization	233,372	249,005	202,320
Corporate, Non-Segment
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	11	0	0
Total depreciation and amortization	28	288	3,658
Segment Reconciling Items
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	0	15,252	16,237
Total depreciation and amortization	0	9,010	22,759
Digital Media | Reportable segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	85,049	80,877	59,693
Total depreciation and amortization	184,658	193,661	145,321
Cybersecurity and Martech | Reportable segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Total capital expenditures	21,094	17,611	16,622
Total depreciation and amortization	$ 48,714	$ 55,344	$ 56,999