Goodwill and Other Intangible Assets (Other Intangible Assets) (Details 2) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	$ 484,310	$ 489,425
Accumulated Amortization	436,676	432,729
Net Carrying Amount	47,634	56,696
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	164,998	164,323
Franchise Agreements [Member]
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	92,158	92,158
Trade Names and Trademarks [Member]
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	61,669	60,994
FCC licenses [Member]
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	11,000	11,000
Other [Member]
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	171	171
Student and Customer Relationships [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	280,411	281,140
Accumulated Amortization	255,881	252,969
Net Carrying Amount	$ 24,530	$ 28,171
Student and Customer Relationships [Member] | Minimum [Member]
Amortized Intangible Assets [Line Items]
Useful Life	2 years	2 years
Student and Customer Relationships [Member] | Maximum [Member]
Amortized Intangible Assets [Line Items]
Useful Life	10 years	10 years
Trade Names and Trademarks [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	$ 113,280	$ 116,081
Accumulated Amortization	95,705	94,408
Net Carrying Amount	$ 17,575	$ 21,673
Trade Names and Trademarks [Member] | Minimum [Member]
Amortized Intangible Assets [Line Items]
Useful Life	2 years	2 years
Trade Names and Trademarks [Member] | Maximum [Member]
Amortized Intangible Assets [Line Items]
Useful Life	10 years	10 years
Network Affiliation Agreements [Member]
Amortized Intangible Assets [Line Items]
Useful Life	10 years	10 years
Gross Carrying Amount	$ 17,400	$ 17,400
Accumulated Amortization	14,282	13,848
Net Carrying Amount	3,118	3,552
Databases and Technology [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	31,705	33,290
Accumulated Amortization	31,705	33,290
Net Carrying Amount	$ 0	$ 0
Databases and Technology [Member] | Minimum [Member]
Amortized Intangible Assets [Line Items]
Useful Life	3 years	3 years
Databases and Technology [Member] | Maximum [Member]
Amortized Intangible Assets [Line Items]
Useful Life	6 years	6 years
Other [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	$ 41,514	$ 41,514
Accumulated Amortization	39,103	38,214
Net Carrying Amount	$ 2,411	$ 3,300
Other [Member] | Minimum [Member]
Amortized Intangible Assets [Line Items]
Useful Life	1 year	1 year
Other [Member] | Maximum [Member]
Amortized Intangible Assets [Line Items]
Useful Life	8 years	8 years