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Income Taxes (Schedule of Per Share Distributions Reported to Shareholders) (Details) - $ / shares
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]        
Ordinary Income   $ 3.22 $ 2.53 $ 2.99
Long-term capital gain   0.04 0.46 0.09
Unrecaptured Sec. 1250 gain   0 0.21 0
Total common share distributions $ 3.32 3.32 3.20 3.08
Tax Treatment of Dividends And Distributions Return of Capital [Axis]   $ 0.06 $ 0 $ 0