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Student Receivables (Narrative) (Details) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Student Receivables [Abstract]  
Student receivables written-off periodgreater than 90 days 
Student receivables, allowance for doubtful accounts$ 7.2 
Outstanding net recourse loan receivable$ 3.3$ 3.5