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Business Combinations - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 05, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2018
Business Acquisition [Line Items]          
Acquisition of CEC, net of cash acquired   $ 0 $ 0 $ 353,556  
Goodwill   776,356 776,359 778,951  
Community Education Centers          
Business Acquisition [Line Items]          
Percentage of voting interests acquired 100.00%        
Acquisition of CEC, net of cash acquired $ 353,600        
Operating expenses     $ 2,300    
Goodwill   $ 163,100   $ 165,656 $ 163,107