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Legal and Regulatory Matters - Brazilian Regulation (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) educational_institution | Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 913,710 | $ 787,102 | $ 1,017,196 | $ 632,216 | $ 951,189 | $ 818,601 | $ 1,017,108 | $ 598,978 | $ 3,350,224 | $ 3,385,876 | $ 3,301,864
Brazil |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of postsecondary educational institutions (educational institution) | educational_institution |  |  |  |  |  |  |  |  |  | 13 |
Percentage of students enrolled in government programs |  |  |  |  |  |  |  |  | 11.00% |  |
Percentage of funds received |  |  |  |  |  |  |  |  | 20.00% |  |
Revenues |  |  |  |  |  |  |  |  | $ 654,070 | $ 765,358 | 690,377
Grant | Brazil |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 112,500 | $ 115,200 | $ 83,900

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