Goodwill and Other Intangible Assets (Other Intangible Assets) (Details 2) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	$ 490,587	$ 509,378
Accumulated Amortization	435,472	447,747
Net Carrying Amount	55,115	61,631
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	170,321	170,805
Franchise Agreements [Member]
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	97,002	97,002
Trade Names and Trademarks [Member]
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	62,169	62,653
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	150	150
Student and Customer Relationships [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	296,773	307,312
Accumulated Amortization	259,893	266,453
Net Carrying Amount	$ 36,880	$ 40,859
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	$ 108,127	$ 114,227
Accumulated Amortization	93,878	98,147
Net Carrying Amount	$ 14,249	$ 16,080
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	16,022	15,588
Net Carrying Amount	1,378	1,812
Databases and Technology [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	30,224	32,376
Accumulated Amortization	28,349	30,293
Net Carrying Amount	$ 1,875	$ 2,083
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	$ 38,063	$ 38,063
Accumulated Amortization	37,330	37,266
Net Carrying Amount	$ 733	$ 797
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