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Goodwill and Other Intangible Assets - Summary of Identifiable Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract]    
Accumulated Amortization $ (29,521) $ (23,150)
Tradenames, net 225,573 562,137
Gross Carrying Amount 255,094 585,287
Net Carrying Amount 225,573 562,137
Tradenames    
Finite-Lived Intangible Assets, Net [Abstract]    
Accumulated Amortization (7,583)  
Gross Carrying Amount 233,156  
Net Carrying Amount 225,573  
Student rosters    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount 20,239 21,358
Accumulated Amortization (20,239) (21,358)
Total 0 0
Other    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount 1,699 1,792
Accumulated Amortization (1,699) (1,792)
Total 0 0
Tradenames    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount 82,088  
Accumulated Amortization (7,583)  
Total $ 74,505  
Estimated useful life (in years) 4 years 9 months 18 days  
Tradenames    
Finite-Lived Intangible Assets, Net [Abstract]    
Gross Carrying Amount   0
Accumulated Amortization   0
Tradenames, net $ 151,068 562,137
Total   $ 0