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Business Combinations - Goodwill (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 01, 2018 | Dec. 31, 2017
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Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill | $ 732,075 | $ 732,540 |  | $ 20,744
Strayer University |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill | 337,381 | 337,381 |  | $ 20,744
Capella University |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill | $ 394,694 | $ 395,159 |  |
Capella Merger |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill |  |  | $ 725,275 |
Capella Merger | Strayer University |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill |  |  | 330,600 |
Capella Merger | Capella University |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill |  |  | $ 394,700 |

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