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Significant Accounting Policies - New Accounting Pronouncements (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) university | Jun. 30, 2017 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings | $ (548,617) |  | $ (548,617) |  |  | $ (946,236)
Revenues | 1,247,917 | $ 1,277,439 | 2,133,205 | $ 2,133,372 |  |
Decrease in operating activities |  |  | (1,834) | 140,763 |  |
Increase in financing activities |  |  | (393,059) | 123,201 |  |
Increase in investing cash flow |  |  | 264,263 | (95,509) |  |
Net periodic benefit cost |  |  | 62 |  |  |
ASU 2014-09 | Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings | $ 6,204 |  | 6,204 |  | $ 1,400 |
Revenues |  |  | $ 498 |  |  |
ASU 2016-15 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Decrease in operating activities |  |  |  | 65,000 |  |
Increase in financing activities |  |  |  | 65,000 |  |
ASU 2016-16 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings |  |  |  |  | $ 2,900 |
ASU 2016-18 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Decrease in operating activities |  |  |  | 318 |  |
Increase in investing cash flow |  |  |  | $ 143 |  |
Chile |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Number of Consolidated Non Profit Universities | university |  |  | 3 |  |  |

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