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Revenue - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |  |
Accounts and notes receivable | $ 533,000 | $ 373,855
Deferred revenue and student deposits, current | 464,340 | $ 193,226
Revenue recognized | $ 175,611 |

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