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Shareholders' Equity (Summary of Preferred Stock) (Details) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Class Of Stock [Line Items]    
Preferred stock, shares authorized 12,500,000  
Preferred stock $ 159,541,000 $ 159,541,000
Series B Preferred Stock [Member]    
Class Of Stock [Line Items]    
Par value $ 0.01  
Liquidation value $ 25.00  
Preferred stock, shares authorized 1,450,000 1,450,000
Shares issued 1,450,000 1,450,000
Shares outstanding 1,450,000 1,450,000
Preferred stock $ 34,767,000 $ 34,767,000
Series C Preferred Stock [Member]    
Class Of Stock [Line Items]    
Par value $ 0.01  
Liquidation value $ 25.00  
Preferred stock, shares authorized 6,450,000 6,450,000
Shares issued 5,000,000 5,000,000
Shares outstanding 5,000,000 5,000,000
Preferred stock $ 124,774,000 $ 124,774,000