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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Condensed Consolidated Balance Sheets    
Series B Convertible Preferred Stock, par value $ 0.01 $ 0.01
Series B Convertible Preferred Stock, shares authorized 260,000 260,000
Series B Convertible Preferred Stock, shares issued 252,500 0
Series B Convertible Preferred Stock, shares outstanding 252,530,000  
Common stock, par value $ 0.01 $ 0.01
Common stock, shares issued 44,303,000 44,301,000
Treasury stock, shares 12,883,000 12,929,000