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CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Preferred Stock, Shares Authorized 20,000,000 20,000,000
Preferred Stock, Shares Issued 0 0
Preferred Stock, Shares Outstanding 0 0
Current assets    
Allowance for doubtful accounts $ 816 $ 1,001
Stockholders equity    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 240,000,000 240,000,000
Common stock, shares issued 73,576,000 71,233,000
Common stock, shares outstanding 49,868,000 51,220,000
Treasury Stock, Shares 23,708,000 20,013,000