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Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of tuition receivable and allowance for doubtful accounts    
Tuition receivable $ 26,145 $ 29,858
Allowances for doubtful accounts (10,303) (6,596)
Tuition receivable, net $ 15,842 $ 23,262