Summary Of Significant Accounting Policies of Tax Treatment of Common Dividends Per Share for Federal Tax Purposes (Details) - $ / shares													3 Months Ended		12 Months Ended
	Oct. 31, 2023	Jul. 31, 2023	Apr. 28, 2023	Jan. 30, 2023	Oct. 31, 2022	Jul. 29, 2022	Apr. 29, 2022	Jan. 28, 2022	Oct. 29, 2021	Jul. 30, 2021	Apr. 30, 2021	Jan. 28, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021		Dec. 18, 2023
Summary Of Significant Accounting Policies [Line Items]
Dividends treatment for federal tax purposes.															$ 4.16	[1]	$ 3.95	[2]	$ 3.92	[3]
Dividends Treatment For Federal Tax Purposes, Percentage															100.00%		100.00%		100.00%
Distributions Payable, Amount Per Unit																					$ 0.98
Dividends, Per Unit, Cash Paid	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98	$ 0.98
Ordinary income
Summary Of Significant Accounting Policies [Line Items]
Dividends treatment for federal tax purposes.															$ 3.04		$ 3.42		$ 2.90
Dividends Treatment For Federal Tax Purposes, Percentage															72.98%		86.60%		73.86%
Capital Gain Income
Summary Of Significant Accounting Policies [Line Items]
Dividends treatment for federal tax purposes.															$ 1.12		$ 0.53		$ 0.57
Dividends Treatment For Federal Tax Purposes, Percentage															27.02%		13.40%		14.57%
Return of Capital
Summary Of Significant Accounting Policies [Line Items]
Dividends treatment for federal tax purposes.															$ 0		$ 0		$ 0.45
Dividends Treatment For Federal Tax Purposes, Percentage															0.00%		0.00%		11.57%
Dividend Declared
Summary Of Significant Accounting Policies [Line Items]
Distributions Payable, Amount Per Unit															$ 0.98
Dividend Declared | Tax Year 2023
Summary Of Significant Accounting Policies [Line Items]
Distributions Payable, Amount Per Unit															0.27
Dividend Declared | Tax Year 2024
Summary Of Significant Accounting Policies [Line Items]
Distributions Payable, Amount Per Unit															$ 0.71
Dividend Paid [Member]
Summary Of Significant Accounting Policies [Line Items]
Dividends, Per Unit, Cash Paid													$ 0.98	$ 0.98
Dividend Paid [Member] | Tax Year 2023
Summary Of Significant Accounting Policies [Line Items]
Dividends, Per Unit, Cash Paid													0.95
Dividend Paid [Member] | Tax Year 2022
Summary Of Significant Accounting Policies [Line Items]
Dividends, Per Unit, Cash Paid													$ 0.03

[1] The fourth quarter 2023 regular quarterly dividend was $0.98 per common share, of which approximately $0.27 per common share was allocable to 2023 and approximately $0.71 per common share was allocable to 2024.

[2] The fourth quarter 2022 regular quarterly dividend was $0.98 per common share, of which approximately $0.03 per common share was allocable to 2022 and approximately $0.95 per common share was allocable to 2023.

[3] The fourth quarter 2021 regular quarterly dividend was $0.98 per common share, all of which was allocable to 2022.