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Consolidated Balance Sheets (Parenthetical) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Real Estate Owned, Accumulated Depreciation $ 1,470,507,000 $ 1,435,683,000
Common Shares, par value $ 0.01 $ 0.01
Common Shares, shares authorized 125,000,000  
Preferred Shares, par value $ 0.01 $ 0.01
Preferred Shares, shares authorized 25,000,000 25,000,000
Treasury Stock, Common, Shares 7,883,581 7,631,725
Dividends Payable, Current $ 22,918,000 $ 25,275,000
Series C Preferred Shares [Member]    
Preferred Shares, shares issued 5,392,916 5,392,916
Preferred Shares, liquidation preference $ 134,822,900 $ 134,822,900
Series E Preferred Shares [Member]    
Preferred Shares, shares issued 3,445,980 3,445,980
Preferred Shares, liquidation preference $ 86,149,500 $ 86,149,500
Series G Preferred Stock [Member]    
Preferred Shares, shares issued 6,000,000 6,000,000
Preferred Shares, liquidation preference $ 150,000,000 $ 150,000,000