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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Statement Of Financial Position [Abstract]    
Accounts receivable, allowances $ 581 $ 561
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 150,000,000 150,000,000
Common stock, shares issued 27,017,824 27,017,824
Treasury stock, shares 11,667,719 11,841,960