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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Student receivables, allowance for doubtful accounts, current $ 12,398us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 14,500us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Student receivables, allowance for doubtful accounts, non-current $ 2,119us-gaap_AllowanceForDoubtfulAccountsReceivableNoncurrent $ 3,070us-gaap_AllowanceForDoubtfulAccountsReceivableNoncurrent
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 300,000,000us-gaap_CommonStockSharesAuthorized 300,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 82,336,689us-gaap_CommonStockSharesIssued 81,889,907us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 67,521,038us-gaap_CommonStockSharesOutstanding 67,170,522us-gaap_CommonStockSharesOutstanding
Treasury, Shares in treasury 14,815,651us-gaap_TreasuryStockShares 14,719,385us-gaap_TreasuryStockShares