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Income Taxes - Narrative (Details) contract in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 USD ($) contract | Sep. 30, 2019 | Sep. 30, 2018 USD ($)
Income Tax Disclosure [Abstract] |  |  |  |
Number of courses under modified contract | contract |  | 1.7 |  |
Pre tax loss |  | $ 362,637,418 |  | $ 344,004,396
Discrete tax benefit |  | $ 25,800,000 |  |
Effective income tax rate (percent) | 23.17% | (7.01%) | 26.30% | (7.39%)

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