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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Current assets    
Allowance for doubtful accounts $ 8,789 $ 6,878
Stockholders’ equity    
Preferred stock, par value in USD per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in USD per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 33,141,879 32,871,504
Common stock, shares outstanding (in shares) 29,623,272 30,016,340
Treasury Stock (in shares) 3,518,607 2,855,164