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Goodwill and Intangible Assets - Intangibles (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subject to amortization      
Accumulated amortization $ (78,389,000) $ (23,056,000)  
Net 87,611,000    
Total      
Intangible assets, gross 351,400,000 351,400,000  
Intangible assets, net 273,011,000 328,344,000  
Impairment of intangible assets 0 5,400,000 $ 0
Student relationships      
Subject to amortization      
Gross carrying amount 166,000,000 166,000,000  
Accumulated amortization (78,389,000) (23,056,000)  
Net 87,611,000 142,944,000  
Trade names      
Not Subject to amortization      
Indefinite-lived intangible assets $ 185,400,000 $ 185,400,000