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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Student receivables, allowance for doubtful accounts, current $ 29,856 $ 23,307
Property and equipment, accumulated depreciation [1] 92,933 198,052
Intangible assets, amortization 1,400 1,400
Student receivables, allowance for doubtful accounts, non-current $ 2,108 $ 1,529
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 85,953,253 85,173,686
Common stock, shares outstanding 70,151,357 69,772,910
Treasury stock, shares 15,801,896 15,400,776
[1] Property and equipment which were fully depreciated and no longer in use by the Company were retired during the year ended December 31, 2019, therefore both the cost of the asset and the related accumulated depreciation balances were reduced to zero for the related assets.