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Business Combinations - Intangible Assets Acquired (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 01, 2018
Dec. 31, 2018
Student relationships    
Business Acquisition [Line Items]    
Weighted average useful life   3 years
Capella Merger    
Business Acquisition [Line Items]    
Total intangible assets $ 349,800  
Capella Merger | Student relationships    
Business Acquisition [Line Items]    
Finite-lived intangible assets, fair value $ 166,000  
Weighted average useful life 3 years  
Capella Merger | Trade names    
Business Acquisition [Line Items]    
Indefinite lived intangible assets, fair value $ 183,800