Summary of Significant Accounting Policies Tax (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Summary Of Significant Accounting Policies [Abstract]
State and local income, franchise and excise tax (benefit)	$ 900	$ 915	$ 852
Income and other tax expense (benefit)	$ 900	$ 915	$ 852
Tax Treatment Of Dividends And Distributions Ordinary Dividends	$ 1.75466	$ 1.40791	$ 1.34739
Tax Treatment Of Dividends And Distributions Long Term Capital Gain	0.42850	0.73687	0.77923
Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain	0.29434	0.26522	0.24838
Dividends and distributions declared per Common Share outstanding	$ 2.47750	$ 2.41000	$ 2.37500