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Legal and Regulatory Matters - Brazilian Regulation (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) educational_institution | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 883,152 | $ 773,699 | $ 992,403 | $ 601,072 | $ 892,451 | $ 778,255 | $ 1,005,229 | $ 614,278 | $ 3,250,326 | $ 3,290,213 | $ 3,333,073
Brazil |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of postsecondary educational institutions (educational institution) | educational_institution |  |  |  |  |  |  |  |  | 12 |  |
Percentage of students enrolled in government programs |  |  |  |  |  |  |  |  | 7.00% | 11.00% |
Percentage of funds received |  |  |  |  |  |  |  |  | 13.00% | 20.00% |
Revenues |  |  |  |  |  |  |  |  | $ 578,433 | $ 654,070 | 765,358
Brazil | Grant |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 100,600 | $ 112,500 | $ 115,200

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