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Revenue Recognition (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Revenues $ 114,668   $ 231,137    
Instruction and educational support 64,690 $ 63,650 128,466 $ 125,066  
Provision (benefit) for income taxes (557) 3,645 1,593 11,532  
Net income 5,188 $ 10,302 14,655 $ 20,880  
Tuition receivable - net 25,595   25,595   $ 23,122
Other current assets 11,385   11,385   11,293
Income taxes payable         1,038
Accounts payable and accrued expenses 46,657   46,657   46,177
Retained earnings 170,712   $ 170,712   162,006
Percentage of tuition revenue in total revenue     96.00%    
Accounting Standards Update 2014-09          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Impact of adoption of new accounting standards         $ (171)
Accounting Standards Update 2014-09 | Balances without Adoption of ASC 606          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Revenues 114,549   $ 230,887    
Instruction and educational support 64,535   128,119    
Provision (benefit) for income taxes (547)   1,620    
Net income 5,214   14,725    
Tuition receivable - net 24,248   24,248    
Other current assets 13,067   13,067    
Income taxes payable 93   93    
Retained earnings 170,954   170,954    
Accounting Standards Update 2014-09 | Effect of Change Higher/Lower          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Revenues 119   250    
Instruction and educational support 155   347    
Provision (benefit) for income taxes (10)   (27)    
Net income (26)   (70)    
Tuition receivable - net 1,347   1,347    
Other current assets (1,682)   (1,682)    
Income taxes payable (93)   (93)    
Retained earnings (242)   (242)    
Tuition          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Revenues 110,300   222,300    
Academic fees          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Revenues 3,000   6,000    
Textbook-related sales          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Revenues 800   1,700    
Other          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Revenues $ 600   $ 1,100