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Income Taxes - Deferred tax assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
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