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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Changes in carrying amount |  |  |  |
Balance, beginning of period |  |  | $ 1,318,526,000 |
Reporting unit reallocation |  |  | 0 |
Additions |  |  | 0 |
Impairments | $ 0 | $ 0 | 0 | $ 0
Currency translation adjustments |  |  | (38,567,000) |
Adjustments to prior acquisitions |  |  | 262,000 |
Balance, end of period | 1,280,221,000 |  | 1,280,221,000 |
U.S. Higher Education |  |  |  |
Changes in carrying amount |  |  |  |
Balance, beginning of period |  |  | 732,075,000 |
Reporting unit reallocation |  |  | (100,000,000) |
Additions |  |  | 0 |
Impairments |  |  | 0 |
Currency translation adjustments |  |  | 0 |
Adjustments to prior acquisitions |  |  | 0 |
Balance, end of period | 632,075,000 |  | 632,075,000 |
Australia / New Zealand |  |  |  |
Changes in carrying amount |  |  |  |
Balance, beginning of period |  |  | 586,451,000 |
Reporting unit reallocation |  |  | 0 |
Additions |  |  | 0 |
Impairments |  |  | 0 |
Currency translation adjustments |  |  | (38,567,000) |
Adjustments to prior acquisitions |  |  | 262,000 |
Balance, end of period | 548,146,000 |  | 548,146,000 |
Alternative Learning |  |  |  |
Changes in carrying amount |  |  |  |
Balance, beginning of period |  |  | 0 |
Reporting unit reallocation |  |  | 100,000,000 |
Additions |  |  | 0 |
Impairments |  |  | 0 |
Currency translation adjustments |  |  | 0 |
Adjustments to prior acquisitions |  |  | 0 |
Balance, end of period | $ 100,000,000 |  | $ 100,000,000 |

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