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Significant Accounting Policies Significant Accounting Policies- Reclassification Operation Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
General and administration | $ 272,411 | $ 194,035 | $ 129,332
Instructional and support costs | $ 530,604 | 371,542 | 268,943
Previously Reported | Instruction and educational support |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
General and administration |  | 0 | 0
Instructional and support costs |  | 340,076 | 249,939
Previously Reported | Admissions advisory |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
General and administration |  | 0 | 0
Instructional and support costs |  | 31,466 | 19,004
Previously Reported | Marketing |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
General and administration |  | 136,979 | 82,540
Instructional and support costs |  | 0 | 0
Previously Reported | General and administration |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
General and administration |  | 57,056 | 46,792
Instructional and support costs |  | $ 0 | $ 0

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