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Income Taxes - Deferred tax assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of tax effects of principal temporary differences that give rise to deferred tax assets |  |
Stock-based compensation | $ 20,477 | $ 16,742
Property and equipment | (6,059) | (9,417)
Other facility-related costs | 5,242 | 8,535
Deferred revenue | 7,182 | 4,267
Tuition receivable | 3,922 | 3,908
Deferred leasing costs | 3,064 | 3,362
Prepaid compensation | (1,139) |
Other | (1,592) | (948)
Net deferred tax asset | $ 31,097 | $ 26,449

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