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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of tax effects of principal temporary differences that give rise to deferred tax assets    
Tuition receivable $ 4,215 $ 4,629
Employee-related liabilities 280 420
Other facility-related costs 826 111
Current net deferred tax asset 5,321 5,160
Property and equipment (15,972) (15,335)
Deferred leasing costs 3,475 4,130
Stock-based compensation 13,814 13,656
Other facility-related costs 1,484 495
Interest rate swap 474 399
Other 4 (19)
Long-term net deferred tax asset 3,279 3,326
Net deferred tax asset $ 8,600 $ 8,486