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Significant Accounting Policies (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of tuition receivable and allowance for doubtful accounts        
Tuition receivable $ 25,777us-gaap_AccountsReceivableGrossCurrent $ 26,145us-gaap_AccountsReceivableGrossCurrent    
Allowances for doubtful accounts (8,835)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (10,303)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (6,596)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (7,279)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Tuition receivable, net $ 16,942us-gaap_AccountsReceivableNetCurrent $ 15,842us-gaap_AccountsReceivableNetCurrent