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Legal and Regulatory Matters - United States Postsecondary Education Regulation (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) educational_institution program | Dec. 31, 2016 USD ($)
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design |  |
Loss Contingencies [Line Items] |  |
Letters of credit outstanding, amount | $ | $ 136,900 | $ 105,600
United States |  |
Loss Contingencies [Line Items] |  |
Number of postsecondary educational institutions (educational institution) | educational_institution | 4 |
Percentage of funds received |  | 15.00%
Number of failed programs (program) | 1 |
Number of in the zone programs (program) | 5 |
Percentage of students enrolled in failed programs | 1.00% |
Percentage of students enrolled in zone programs | 5.00% |

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Details
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