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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Patient accounts receivable, allowance for doubtful accounts $ 16,710 $ 16,526
Property and equipment, accumulated depreciation 144,055 141,793
Intangible assets, accumulated amortization $ 27,180 $ 25,386
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, issued 0 0
Preferred stock, outstanding 0 0
Common Stock, par value $ 0.001 $ 0.001
Common Stock, shares authorized 60,000,000 60,000,000
Common Stock, shares issued 35,195,655 34,786,966
Common Stock, shares outstanding 33,551,441 33,607,282
Treasury Stock at cost, shares 1,644,214 1,179,684