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Goodwill and Intangible Assets - Intangibles Impairment (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Aug. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |
Measurement period adjustment, goodwill |  | $ (465,000) | $ 1,811,000 |
Impairment of goodwill |  | $ 0 | 13,944,000 | $ 0
Useful life - acquired |  | 3 years |  |
Finite-lived intangible assets |  | $ 87,611,000 |  |
Amortization expenses |  | 61,667,000 | 25,694,000 | $ 0
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |
2020 |  | 55,333,000 |  |
2021 |  | 32,278,000 |  |
2022 |  | 0 |  |
2023 |  | 0 |  |
2024 |  | 0 |  |
2025 and thereafter |  | 0 |  |
Net |  | 87,611,000 |  |
New York Code And Design Academy, Inc. |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |
Impairment of goodwill |  |  | 13,900,000 |
Capella Merger |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |
Measurement period adjustment, goodwill |  | 500,000 |  |
Student relationships |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |
Useful life - acquired | 3 years |  |  |
Finite-lived intangible assets |  | 87,611,000 | 142,944,000 |
Amortization expenses |  | 55,300,000 | 23,100,000 |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |
Net |  | 87,611,000 | 142,944,000 |
Student relationships | Capella Merger |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |
Useful life - acquired | 3 years |  |  |
Capella University |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |
Measurement period adjustment, goodwill |  | $ (465,000) | 1,811,000 |
Strayer University |  |  |  |
Finite Lived And Indefinite Lived Intangible Assets By Major Class [Line Items] |  |  |  |
Impairment of goodwill |  |  | $ 13,944,000 |

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