Goodwill and Other Intangible Assets (Other Intangible Assets) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	$ 544,128	$ 581,877
Accumulated Amortization	382,706	334,757
Net Carrying Amount	161,422	247,120
Indefinite-lived Intangible Assets [Line Items]
Net Carrying Amount	178,934	142,180
Student and Customer Relationships [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	297,766	300,027
Accumulated Amortization	230,429	206,714
Net Carrying Amount	67,337	93,313
Trade Names and Trademarks [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	148,102	158,365
Accumulated Amortization	81,078	68,113
Net Carrying Amount	$ 67,024	$ 90,252
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	10,367	8,628
Net Carrying Amount	7,033	8,772
Databases and Technology [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	36,216	36,585
Accumulated Amortization	32,219	26,464
Net Carrying Amount	3,997	10,121
Non-compete Agreements [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	1,000	1,000
Accumulated Amortization	995	991
Net Carrying Amount	5	9
Other [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount	43,644	68,500
Accumulated Amortization	27,618	23,847
Net Carrying Amount	$ 16,026	$ 44,653
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] | Non-compete Agreements [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	2 years	2 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] | Non-compete Agreements [Member]
Amortized Intangible Assets [Line Items]
Useful Life (in years)	5 years	5 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	$ 85,858	$ 44,058
Trade Names and Trademarks [Member]
Indefinite-lived Intangible Assets [Line Items]
Net Carrying Amount	81,905	86,972
FCC licenses [Member]
Indefinite-lived Intangible Assets [Line Items]
Net Carrying Amount	11,000	11,000
Licensure and Accreditation [Member]
Indefinite-lived Intangible Assets [Line Items]
Net Carrying Amount	150	150
Other [Member]
Indefinite-lived Intangible Assets [Line Items]
Net Carrying Amount	$ 21	$ 0