Goodwill and Other Intangible Assets (Other Intangible Assets) (Details 2) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	$ 520,495	$ 521,752
Accumulated Amortization	418,869	409,558
Net Carrying Amount	101,626	112,194
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	187,319	187,862
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	83,990	84,533
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	282,190	283,098
Accumulated Amortization	242,044	236,776
Net Carrying Amount	$ 40,146	$ 46,322
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	$ 143,163	$ 143,389
Accumulated Amortization	93,733	90,558
Net Carrying Amount	$ 49,430	$ 52,831
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	15 years	15 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	12,543	13,348
Net Carrying Amount	4,857	4,052
Databases and Technology [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	36,228	36,538
Accumulated Amortization	35,815	35,712
Net Carrying Amount	$ 413	$ 826
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	$ 41,327
Accumulated Amortization	34,734	33,164
Net Carrying Amount	$ 6,780	$ 8,163
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