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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Student receivables, allowance for doubtful accounts, current $ 19,986 $ 20,533
Property and equipment, accumulated depreciation 213,056 213,825
Intangible assets, amortization 1,400 1,400
Student receivables, allowance for doubtful accounts, non-current $ 2,565 $ 2,001
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 84,987,946 84,279,533
Common stock, shares outstanding 69,611,001 69,117,803
Treasury stock, Shares 15,376,945 15,161,730