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Significant Accounting Policies - Schedule of impact of Topic 606 adoption on Balance Sheets (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Deferred costs, net | $ 68,078 |  | $ 64,128
Liabilities: |  |  |
Deferred revenue and student deposits | 351,951 |  | 312,422
Deferred income taxes | 295,043 |  | 278,215
Equity: |  |  |
Accumulated deficit | (548,617) |  | $ (946,236)
Balances Without Adoption of ASC 606 |  |  |
Assets |  |  |
Deferred costs, net | 62,319 |  |
Liabilities: |  |  |
Deferred revenue and student deposits | 352,449 |  |
Deferred income taxes | 294,990 |  |
Equity: |  |  |
Accumulated deficit | (554,821) |  |
ASU 2014-09 | Effect of Change Higher/(Lower) |  |  |
Assets |  |  |
Deferred costs, net | 5,759 |  |
Liabilities: |  |  |
Deferred revenue and student deposits | (498) |  |
Deferred income taxes | 53 |  |
Equity: |  |  |
Accumulated deficit | $ 6,204 | $ 1,400 |

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