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Summary Of Significant Accounting Policies Schedule of Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes (Details) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 17, 2019
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]        
Dividends treatment for federal tax purposes. $ 3.15 [1] $ 3.57 [2] $ 2.91 [3]  
Dividends Treatment For Federal Tax Purposes, Percentage 100.00% 100.00% 100.00%  
Dividends Payable, Amount Per Share       $ 0.98
Dividend Declared        
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]        
Dividends Payable, Amount Per Share $ 0.98 $ 0.95 $ 0.80  
Allocated to fiscal 2020        
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]        
Dividends Payable, Amount Per Share 0.94      
Allocated to fiscal 2019        
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]        
Special dividend / distribution (per share / common unit amount) 0.04      
Dividends Payable, Amount Per Share   0.26    
Allocated to fiscal 2018        
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]        
Special dividend / distribution (per share / common unit amount)   0.69    
Dividends Payable, Amount Per Share     0.33  
Allocated to fiscal 2017        
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]        
Special dividend / distribution (per share / common unit amount)     0.47  
Capital Gains Income        
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]        
Dividends treatment for federal tax purposes. $ 0.16 $ 0.78 $ 0.05  
Dividends Treatment For Federal Tax Purposes, Percentage 5.16% 21.83% 1.71%  
Ordinary Income        
Tax Treatment Of Common Dividends Per Share For Federal Tax Purposes [Line Items]        
Dividends treatment for federal tax purposes. $ 2.99 $ 2.79 $ 2.86  
Dividends Treatment For Federal Tax Purposes, Percentage 94.84% 78.17% 98.29%  
[1]
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 is allocable to 2020.
[2]
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 is allocable to 2019.
[3]
The fourth quarter 2017 regular quarterly dividend was $0.80 per common share of which approximately $0.47 per common share was allocable to 2017 and approximately $0.33 per common share is allocable to 2018.