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Legal and Regulatory Matters - Turkish Regulation and Internal Investigation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets | $ 6,769,636 |  |  |  | $ 7,391,285 |  |  |  | $ 6,769,636 | $ 7,391,285 |
Liabilities | 4,704,294 |  |  |  | 5,390,006 |  |  |  | 4,704,294 | 5,390,006 |
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
Operating income (loss) | 139,807 | $ 25,576 | $ 218,218 | $ (92,619) | 140,116 | $ 24,860 | $ 196,047 | $ (119,030) | 290,982 | 241,993 | 290,677
Kendall College, St. Augustine, Walden University, and NewSchool of Architecture and Design |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount | 139,000 |  |  |  | 136,900 |  |  |  | 139,000 | 136,900 |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets | 1,196,813 |  |  |  | 1,419,579 |  |  |  | 1,196,813 | 1,419,579 |
Liabilities | $ 274,744 |  |  |  | $ 449,561 |  |  |  | 274,744 | 449,561 |
Revenues |  |  |  |  |  |  |  |  | $ 100,227 | $ 123,237 | $ 113,276

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