Goodwill and Other Intangible Assets (Other Intangible Assets) (Details 2) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	$ 521,752	$ 544,128
Accumulated Amortization	409,558	382,706
Net Carrying Amount	112,194	161,422
Indefinite-lived Intangible Assets [Line Items]
Net Carrying Amount	187,862	178,934
Student and Customer Relationships [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	283,098	297,766
Accumulated Amortization	236,776	230,429
Net Carrying Amount	46,322	67,337
Trade Names and Trademarks [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	143,389	148,102
Accumulated Amortization	90,558	81,078
Net Carrying Amount	$ 52,831	$ 67,024
Network affiliation agreements [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	10 years	10 years
Gross Carrying Amount	$ 17,400	$ 17,400
Accumulated Amortization	13,348	10,367
Net Carrying Amount	4,052	7,033
Databases and Technology [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	36,538	36,216
Accumulated Amortization	35,712	32,219
Net Carrying Amount	826	3,997
Other [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	41,327	44,644
Accumulated Amortization	33,164	28,613
Net Carrying Amount	$ 8,163	$ 16,031
Minimum [Member] | Student and Customer Relationships [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	2 years	2 years
Minimum [Member] | Trade Names and Trademarks [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	2 years	2 years
Minimum [Member] | Databases and Technology [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	3 years	3 years
Minimum [Member] | Other [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	1 year	1 year
Maximum [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	15 years
Maximum [Member] | Student and Customer Relationships [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	10 years	10 years
Maximum [Member] | Trade Names and Trademarks [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	15 years	15 years
Maximum [Member] | Databases and Technology [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	6 years	6 years
Maximum [Member] | Other [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	8 years	8 years
Franchise Rights [Member]
Indefinite-lived Intangible Assets [Line Items]
Net Carrying Amount	$ 92,158	$ 85,858
Trade Names and Trademarks [Member]
Indefinite-lived Intangible Assets [Line Items]
Net Carrying Amount	84,533	81,905
FCC licenses [Member]
Indefinite-lived Intangible Assets [Line Items]
Net Carrying Amount	11,000	11,000
Other [Member]
Indefinite-lived Intangible Assets [Line Items]
Net Carrying Amount	$ 171	$ 171