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Commitments and Contingencies - Standby Letters of Credit, Surety Bonds and Other Commitments (Details) - USD ($) |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 12, 2017 | Nov. 30, 2016 | Sep. 30, 2017 | Dec. 31, 2016
Surety Bond |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Guarantee amount, maximum potential amount of payments |  |  | $ 13,980,000 | $ 12,162,000
Cash Collateralized Letter Of Credit - Spain Tax Audits |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of credit outstanding, amount |  |  | 39,236,000 | 34,746,000
Non-Collateralized Surety Bond - UAM Brazil | Surety Bond |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Guarantee amount, maximum potential amount of payments |  | $ 15,300,000 |  |
Cost of surety bond |  | $ 1,400,000 |  |
Guarantor obligation, term |  | P5Y |  |
Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Required increase to remain a financially responsible institution, percent | 50.00% |  |  |
Required to be increase to amount, to remain a financially responsible institution | $ 456,293,000 |  |  |
Required percentage of increase in outstanding amount | 15.00% |  |  |
Required to be increase to amount, to remain provisionally certified | $ 136,888,000 |  |  |
Minimum required period to remain provisionally certified | 3 years |  |  |
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of credit outstanding, amount |  |  | $ 105,600,000 | $ 105,600,000

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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