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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2020
Dec. 31, 2019
Condensed Consolidated Balance Sheets [Abstract]    
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 600,000,000 600,000,000
Preferred stock, shares issued 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 230,000,000 230,000,000
Common stock, shares issued 36,682,000 36,323,000
Treasury stock, shares at cost 8,703,000 8,568,000