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Goodwill and Intangible Assets - Intangibles (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Subject to amortization |  |  |
Accumulated amortization | $ (78,389,000) | $ (23,056,000) |
Net | 87,611,000 |  |
Total |  |  |
Intangible assets, gross | 351,400,000 | 351,400,000 |
Intangible assets, net | 273,011,000 | 328,344,000 |
Impairment of intangible assets | 0 | 5,400,000 | $ 0
Student relationships |  |  |
Subject to amortization |  |  |
Gross carrying amount | 166,000,000 | 166,000,000 |
Accumulated amortization | (78,389,000) | (23,056,000) |
Net | 87,611,000 | 142,944,000 |
Trade names |  |  |
Not Subject to amortization |  |  |
Indefinite-lived intangible assets | $ 185,400,000 | $ 185,400,000 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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