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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Changes in carrying amount |  |  |
Balance, beginning of period | $ 732,540,000 | $ 20,744,000 |
Additions |  | 723,929,000 |
Impairments | 0 | (13,944,000) | $ 0
Measurement period adjustment, goodwill | (465,000) | 1,811,000 |
Balance, end of period | 732,075,000 | 732,540,000 | 20,744,000
Strayer University |  |  |
Changes in carrying amount |  |  |
Balance, beginning of period | 337,381,000 | 20,744,000 |
Additions |  | 330,581,000 |
Impairments |  | (13,944,000) |
Balance, end of period | 337,381,000 | 337,381,000 | $ 20,744,000
Capella University |  |  |
Changes in carrying amount |  |  |
Balance, beginning of period | 395,159,000 |  |
Additions |  | 393,348,000 |
Measurement period adjustment, goodwill | (465,000) | 1,811,000 |
Balance, end of period | $ 394,694,000 | $ 395,159,000 |

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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