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Revenue Recognition - Graduation Fund (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Graduation Fund [Roll Forward]    
Balance at beginning of period $ 49,641 $ 43,329
Revenue deferred 26,462 30,071
Benefit redeemed (22,789) (23,759)
Balance at end of period 53,314 49,641
Undergraduate Degree Programs    
Graduation Fund [Roll Forward]    
Balance at beginning of period 49,600  
Balance at end of period $ 52,600 $ 49,600