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Consolidated Statement of Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023
Shares pursuant to dividend reinvestment plan	15,992	17,086	16,007	14,690	15,588	13,227
Shares due to exercise of employee stock options and issuance of directors' deferred stock	8,190	4,375	183	895	3,104	699
Limited Partner
Issuance of partnership units pursuant to dividend reinvestment plan (in shares)	40,039	43,696	306,512
O 2024 Q1 Dividends
Distributions payable common stock, per share (in usd per share)			$ 0.59
Distributions partnership units, per unit (in usd per share)			0.59
O 2024 Q2 Dividends
Distributions payable common stock, per share (in usd per share)		$ 0.59
Distributions partnership units, per unit (in usd per share)			0.59
O 2024 Q3 Dividends
Distributions payable common stock, per share (in usd per share)	$ 0.59
Distributions partnership units, per unit (in usd per share)	0.59
O 2023 Q1 Dividends
Distributions payable common stock, per share (in usd per share)						$ 0.59
Distributions partnership units, per unit (in usd per share)						0.59
O 2023 Q2 Dividends
Distributions payable common stock, per share (in usd per share)					$ 0.59
Distributions partnership units, per unit (in usd per share)					0.59
O 2023 Q3 Dividends
Distributions payable common stock, per share (in usd per share)				$ 0.59
Distributions partnership units, per unit (in usd per share)				0.59
Series D Cumulative Redeemable, 30,000 shares issued and outstanding | O 2024 Q1 Dividends
Distributions payable on preferred stock, per share (in usd per share)			38.28
Series D Cumulative Redeemable, 30,000 shares issued and outstanding | O 2024 Q2 Dividends
Distributions payable on preferred stock, per share (in usd per share)		38.28
Series D Cumulative Redeemable, 30,000 shares issued and outstanding | O 2024 Q3 Dividends
Distributions payable on preferred stock, per share (in usd per share)	38.28
Series D Cumulative Redeemable, 30,000 shares issued and outstanding | O 2023 Q1 Dividends
Distributions payable on preferred stock, per share (in usd per share)						38.28
Series D Cumulative Redeemable, 30,000 shares issued and outstanding | O 2023 Q2 Dividends
Distributions payable on preferred stock, per share (in usd per share)					38.28
Series D Cumulative Redeemable, 30,000 shares issued and outstanding | O 2023 Q3 Dividends
Distributions payable on preferred stock, per share (in usd per share)				38.28
Series E Cumulative Redeemable, 44,000 shares issued and outstanding | O 2024 Q1 Dividends
Distributions payable on preferred stock, per share (in usd per share)			$ 37.50
Series E Cumulative Redeemable, 44,000 shares issued and outstanding | O 2024 Q2 Dividends
Distributions payable on preferred stock, per share (in usd per share)		$ 37.50
Series E Cumulative Redeemable, 44,000 shares issued and outstanding | O 2024 Q3 Dividends
Distributions payable on preferred stock, per share (in usd per share)	$ 37.50
Series E Cumulative Redeemable, 44,000 shares issued and outstanding | O 2023 Q1 Dividends
Distributions payable on preferred stock, per share (in usd per share)						$ 37.50
Series E Cumulative Redeemable, 44,000 shares issued and outstanding | O 2023 Q2 Dividends
Distributions payable on preferred stock, per share (in usd per share)					$ 37.50
Series E Cumulative Redeemable, 44,000 shares issued and outstanding | O 2023 Q3 Dividends
Distributions payable on preferred stock, per share (in usd per share)				$ 37.50

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