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Goodwill and Intangible Assets - Intangibles (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Subject to amortization    
Accumulated Amortization $ (23,056)  
Net 142,944  
Total    
Intangible assets, gross 351,400 $ 7,260
Intangible assets, net 328,344 7,260
Trade names    
Not Subject to amortization    
Net 185,400 7,260
Student relationships    
Subject to amortization    
Gross Carrying Amount 166,000  
Accumulated Amortization (23,056)  
Net $ 142,944 $ 0