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Summary Of Significant Accounting Policies of Tax Treatment of Common Dividends Per Share for Federal Tax Purposes (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 15, 2020
Summary Of Significant Accounting Policies [Line Items]        
Dividends Treatment For Federal Tax Purposes, Percentage 100.00% 100.00% 100.00%  
Dividends treatment for federal tax purposes. $ 3.88 [1] $ 3.15 [2] $ 3.57 [3]  
Distributions Payable, Amount Per Unit       $ 0.98
Ordinary income        
Summary Of Significant Accounting Policies [Line Items]        
Dividends Treatment For Federal Tax Purposes, Percentage 64.91% 94.84% 78.17%  
Dividends treatment for federal tax purposes. $ 2.52 $ 2.99 $ 2.79  
Capital Gain Income        
Summary Of Significant Accounting Policies [Line Items]        
Dividends Treatment For Federal Tax Purposes, Percentage 25.49% 5.16% 21.83%  
Dividends treatment for federal tax purposes. $ 0.99 $ 0.16 $ 0.78  
Return of Capital        
Summary Of Significant Accounting Policies [Line Items]        
Dividends Treatment For Federal Tax Purposes, Percentage 9.60% 0.00% 0.00%  
Dividends treatment for federal tax purposes. $ 0.37 $ 0 $ 0  
Dividend Declared        
Summary Of Significant Accounting Policies [Line Items]        
Distributions Payable, Amount Per Unit $ 0.98 0.98 0.95  
Allocated to 2019        
Summary Of Significant Accounting Policies [Line Items]        
Distributions Payable, Amount Per Unit   0.04 0.26  
Allocated to 2020        
Summary Of Significant Accounting Policies [Line Items]        
Distributions Payable, Amount Per Unit   $ 0.94    
Allocated to 2018        
Summary Of Significant Accounting Policies [Line Items]        
Distributions Payable, Amount Per Unit     $ 0.69  
[1] The fourth quarter 2020 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2021.
[2] The fourth quarter 2019 regular quarterly dividend was $0.98 per common share of which approximately $0.04 per common share was allocable to 2019 and approximately $0.94 per common share was allocable to 2020.
[3] The fourth quarter 2018 regular quarterly dividend was $0.95 per common share of which approximately $0.69 per common share was allocable to 2018 and approximately $0.26 per common share was allocable to 2019.