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Goodwill and Other Intangible Assets (Other Intangible Assets) (Details 2) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Amortized Intangible Assets [Line Items]    
Gross Carrying Amount $ 440,495 $ 440,105
Accumulated Amortization 202,820 176,844
Net Carrying Amount 237,675 263,261
Indefinite-Lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets 126,986 99,052
Trade Names and Trademarks [Member]    
Indefinite-Lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets 80,036 80,102
Franchise Agreements [Member]    
Indefinite-Lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets 28,000 0
FCC licenses [Member]    
Indefinite-Lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets 18,800 18,800
Licensure and Accreditation [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 282,879 282,761
Accumulated Amortization 131,101 114,429
Net Carrying Amount $ 151,778 $ 168,332
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 $ 87,308 $ 87,285
Accumulated Amortization 44,113 39,825
Net Carrying Amount $ 43,195 $ 47,460
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 4,277 3,408
Net Carrying Amount 13,123 13,992
Databases and Technology [Member]    
Amortized Intangible Assets [Line Items]    
Gross Carrying Amount 27,020 27,041
Accumulated Amortization 10,902 8,471
Net Carrying Amount $ 16,118 $ 18,570
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
Non-compete Agreements [Member]    
Amortized Intangible Assets [Line Items]    
Gross Carrying Amount $ 1,358 $ 1,088
Accumulated Amortization 897 838
Net Carrying Amount $ 461 $ 250
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 $ 24,530 $ 24,530
Accumulated Amortization 11,530 9,873
Net Carrying Amount $ 13,000 $ 14,657
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