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Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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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

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