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Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Revenues                 $ 634,185 $ 454,851 $ 441,088
Instruction and educational support                 340,076 249,939 242,099
Provision (benefit) for income taxes                 (3,468) 32,034 22,490
Net income (loss) $ 22,455 $ (52,781) $ 5,188 $ 9,467 $ (6,495) $ 6,227 $ 10,302 $ 10,578 (15,671) 20,612 $ 34,802
Tuition receivable - net 55,694       23,122       55,694 23,122  
Other current assets 15,814       11,293       15,814 11,293  
Income taxes payable 419       1,038       419 1,038  
Retained earnings 118,322       $ 162,006       118,322 $ 162,006  
Accounting Standards Update 2014-09                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Impact of adoption of new accounting standards (171)               (171)    
Accounting Standards Update 2014-09 | Balances without Adoption of ASC 606                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Revenues                 634,248    
Instruction and educational support                 340,083    
Provision (benefit) for income taxes                 (3,453)    
Net income (loss)                 (15,630)    
Tuition receivable - net 54,660               54,660    
Other current assets 17,142               17,142    
Income taxes payable 500               500    
Retained earnings 118,535               118,535    
Accounting Standards Update 2014-09 | Effect of Change Higher/Lower                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Revenues                 (63)    
Instruction and educational support                 (7)    
Provision (benefit) for income taxes                 (15)    
Net income (loss)                 (41)    
Tuition receivable - net 1,034               1,034    
Other current assets (1,328)               (1,328)    
Income taxes payable (81)               (81)    
Retained earnings $ (213)               $ (213)