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Summary of Significant Accounting Policies Tax (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary Of Significant Accounting Policies [Abstract] |  |  |
State and local income, franchise and excise tax (benefit) | $ 852 | $ 963 | $ 878
Alternative minimum tax credit (benefit) |  | (3,244) |
Income and other tax expense (benefit) | $ 852 | $ (2,281) | $ 878
Tax Treatment Of Dividends And Distributions Ordinary Dividends | $ 1.34739 | $ 1.39604 | $ 1.84454
Tax Treatment Of Dividends And Distributions Long Term Capital Gain | 0.77923 | 0.61243 | 0.21423
Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain | 0.24838 | 0.23403 | 0.06498
Dividends and distributions declared per Common Share outstanding | $ 2.37500 | $ 2.24250 | $ 2.12375

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- Definition The cash outflow for gains from qualifying investments owned for longer than 12 months and then sold for prices greater than the purchase prices. Taxes can be deferred until the sale of assets. + References No definition available. + Details
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- Definition The cash outflow related to a type of depreciation-recapture income that is realized on the sale of depreciable real estate. Unrecaptured Section 1250 income is taxed at a 25% maximum capital gains rate (or in some cases less). + References No definition available. + Details
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