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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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Discrete Tax Benefit

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Government contract, number of courses to be purchased under modified contract.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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-SubTopic 10
-Section 50
-Paragraph 13
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Amount, before tax, of income (loss) attributable to parent. Includes, but is not limited to, income (loss) from continuing operations, discontinued operations and equity method investments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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