Goodwill and Other Intangible Assets (Other Intangible Assets) (Details 2) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Amortized Intangible Assets [Line Items]
Gross Carrying Amount		$ 256,956		$ 204,217
Accumulated Amortization		103,032		96,278
Net Carrying Amount		153,924		107,939
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets, Net		93,203		66,026
Trade Names and Trademarks [Member]
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets, Net		65,953		65,192
FCC licenses [Member]
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets, Net		26,600		0
Licensure and Accreditation [Member]
Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets, Net		650		834
Student and Customer Relationships [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount		131,975		129,616
Accumulated Amortization		60,389		55,863
Net Carrying Amount		$ 71,586		73,753
Student and Customer Relationships [Member] | Minimum [Member]
Amortized Intangible Assets [Line Items]
Useful Life	[1]	1 year	2 years
Student and Customer Relationships [Member] | Maximum [Member]
Amortized Intangible Assets [Line Items]
Useful Life	[1]	10 years	10 years
Trade Names and Trademarks [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount		$ 56,270		55,240
Accumulated Amortization		30,654		29,670
Net Carrying Amount		$ 25,616		25,570
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		15 years
Gross Carrying Amount		$ 45,900		0
Accumulated Amortization		638		0
Net Carrying Amount		45,262		0
Databases and Technology [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount		9,051		5,601
Accumulated Amortization		4,565		4,368
Net Carrying Amount		$ 4,486		1,233
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		5 years	5 years
Non-compete Agreements [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount		$ 1,730		1,730
Accumulated Amortization		1,464		1,404
Net Carrying Amount		$ 266		326
Non-compete Agreements [Member] | Minimum [Member]
Amortized Intangible Assets [Line Items]
Useful Life		2 years	2 years
Non-compete Agreements [Member] | Maximum [Member]
Amortized Intangible Assets [Line Items]
Useful Life		5 years	5 years
Other [Member]
Amortized Intangible Assets [Line Items]
Gross Carrying Amount		$ 12,030		12,030
Accumulated Amortization		5,322		4,973
Net Carrying Amount		$ 6,708		$ 7,057
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

[1] The Company's student and customer relationships’ minimum useful life was 2 years as of December 31, 2016.