Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)		1 Months Ended			3 Months Ended		12 Months Ended
	Dec. 01, 2023	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Accumulated impairment charges		$ 185,500,000		$ 163,800,000	$ 185,500,000		$ 185,500,000	$ 163,800,000
Purchase accounting adjustments								(2,834,000)
Reduction in carrying about of goodwill							560,000	1,344,000
Impairment charge related to goodwill		$ 19,800,000	$ 1,900,000	$ 40,700,000			21,718,000	40,717,000
Aggregate amortization expense for amortizable intangible assets							40,500,000	41,500,000	$ 39,100,000
Impairment of identifiable intangible assets								0	$ 0
Impairment charges for indefinite-lived intangible assets	$ 0
Domestic Operations
Goodwill [Line Items]
Purchase accounting adjustments								(2,834,000)
Reduction in carrying about of goodwill							560,000	1,344,000
Impairment charge related to goodwill							0	0
Impairment of identifiable intangible assets					$ 42,400,000
International and Other
Goodwill [Line Items]
Purchase accounting adjustments								0
Reduction in carrying about of goodwill							0	0
Impairment charge related to goodwill						$ 1,900,000	21,718,000	$ 40,717,000
Impairment of identifiable intangible assets						$ 23,000,000
International and Other | 25/7 Media
Goodwill [Line Items]
Impairment charge related to goodwill							$ 19,800,000