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Income Taxes - Deferred tax assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of tax effects of principal temporary differences that give rise to deferred tax assets |  |
Stock-based compensation | $ 15,024 | $ 20,477
Property and equipment | (3,326) | (6,059)
Other facility-related costs | 2,622 | 5,242
Deferred revenue | 5,445 | 7,182
Tuition receivable |  | 3,922
Deferred leasing costs | 1,789 | 3,064
Prepaid compensation | (373) | (1,139)
Other | 3,271 | (1,592)
Net deferred tax asset | $ 24,452 | $ 31,097

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- Definition The tax effect as of the balance sheet date of the amount of estimated future tax effect attributable to the difference between the tax basis of the deferred gain on sale of property and the basis of the deferred gain on sale of property in accordance with generally accepted accounting principles. + References No definition available. + Details
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