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Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of tuition receivable and allowance for doubtful accounts |  |  |  |
Tuition receivable | $ 23,650 us-gaap_AccountsReceivableGrossCurrent | $ 25,777 us-gaap_AccountsReceivableGrossCurrent |  |
Allowances for doubtful accounts | (8,688)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | (8,835)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | (10,842)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | (10,303)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Tuition receivable, net | $ 14,962 us-gaap_AccountsReceivableNetCurrent | $ 16,942 us-gaap_AccountsReceivableNetCurrent |  |

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