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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Student receivables, allowance for doubtful accounts, current $ 21,197 $ 27,900
Student receivables, allowance for doubtful accounts, current $ 6,890 $ 11,965
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 300,000,000 300,000,000
Common stock, shares issued 81,889,907 81,616,987
Common stock, shares outstanding 67,170,522 67,069,734
Treasury, Shares in treasury 14,719,385 14,547,253