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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
shares in Thousands
Sep. 30, 2021
Dec. 31, 2020
Stockholders' equity:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 85,000 85,000
Common stock, shares issued (in shares) 46,410 46,410
Common stock, shares outstanding (in shares) 40,738 40,738
Treasury stock, at cost (in shares) 5,672 5,672