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Business Combinations - Preliminary Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Aug. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Preliminary fair value of assets and liabilities |  |  |  |
Goodwill | $ 732,540 |  | $ 20,744 | $ 20,744
Capella Merger |  |  |  |
Preliminary fair value of assets and liabilities |  |  |  |
Cash and cash equivalents |  | $ 167,859 |  |
Marketable securities, current |  | 31,419 |  |
Tuition receivable |  | 39,141 |  |
Income tax receivable |  | 163 |  |
Other current assets |  | 8,496 |  |
Marketable securities, non-current |  | 34,700 |  |
Property and equipment, net |  | 53,182 |  |
Other assets |  | 14,556 |  |
Intangible assets |  | 349,800 |  |
Goodwill |  | 725,740 |  |
Total assets acquired |  | 1,425,056 |  |
Accounts payable and accrued expenses |  | (46,735) |  |
Contract liabilities |  | (39,000) |  |
Deferred income taxes |  | (100,123) |  |
Other long term liabilities |  | (2,237) |  |
Total liabilities assumed |  | (188,095) |  |
Total consideration |  | $ 1,236,961 |  |

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