Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Tax Treatment Of Dividend
Internal taxable income distribution policy (in percentage)	100.00%
Estimated taxable income net	$ 101,184	$ 81,375	$ 74,079
Net basis difference of assets and liabilities between tax basis and GAAP basis	$ 144,100
Minimum
Tax Treatment Of Dividend
Real estate investment trust distributable income policy (in percentage)	90.00%
Ordinary Income
Tax Treatment Of Dividend
Payments of dividends net percent	58.30%	100.00%	99.60%
Long Term Capital Gain
Tax Treatment Of Dividend
Payments of dividends net percent	41.70%		0.40%