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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
CONDENSED CONSOLIDATED BALANCE SHEETS    
Accounts receivable, net of allowance for doubtful accounts $ 800 $ 1,000
Series preferred stock, shares authorized 5,000,000 5,000,000
Series preferred stock, outstanding 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 75,000,000 75,000,000
Common stock, shares issued 27,633,000 27,558,000
Common stock, shares outstanding 25,918,000 25,877,000
Treasury stock, shares 1,715,000 1,681,000