Student Receivables (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Student Receivables [Abstract]
Student receivables write-off period, days past due	greater than 90 days
Student receivables, net of allowance for doubtful accounts and net of deferred tuition revenue	$ 6.1
Outstanding net recourse loan receivable	$ 3.2	$ 3.5