CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Preferred Shares [Member]	Common Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Distributions in Excess of Net Income [Member]	Deferred Compensation Obligation [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Treasury Stock at Cost [Member]	Non-Controlling Interests [Member]
Beginning Balance at Dec. 31, 2022	$ 2,092,622	$ 175,000	$ 5,239	$ 5,943,812	$ (4,046,370)	$ 5,025	$ 9,038	$ (4,916)	$ 5,794
Issuance of common shares related to stock plans	13	0	0	13	0	0	0	0	0
Repurchase of common shares	(26,611)	0	0	(26,611)	0	0	0	0	0
Stock-based compensation, net	(1,151)	0	0	(1,042)	0	(84)	0	(25)	0
Repurchase of OP units	(1,735)	0	0	4,059	0	0	0	0	(5,794)
Distributions to non-controlling interests	(18)	0	0	0	0	0	0	0	(18)
Dividends declared-common shares	(54,586)	0	0	0	(54,586)	0	0	0	0
Dividends declared-preferred shares	(5,578)	0	0	0	(5,578)	0	0	0	0
Comprehensive income (loss)	21,742	0	0	0	20,637	0	1,087	0	18
Ending Balance at Jun. 30, 2023	2,024,698	175,000	5,239	5,920,231	(4,085,897)	4,941	10,125	(4,941)	0
Beginning Balance at Dec. 31, 2022	2,092,622	175,000	5,239	5,943,812	(4,046,370)	5,025	9,038	(4,916)	5,794
Comprehensive income (loss)	72,314
Ending Balance at Sep. 30, 2023	2,046,717	175,000	5,239	5,921,778	(4,067,355)	5,053	12,055	(5,053)	0
Beginning Balance at Jun. 30, 2023	2,024,698	175,000	5,239	5,920,231	(4,085,897)	4,941	10,125	(4,941)	0
Issuance of common shares related to stock plans	7	0	0	7	0	0	0	0	0
Stock-based compensation, net	1,540	0	0	1,540	0	112	0	(112)	0
Dividends declared-common shares	(27,311)	0	0	0	(27,311)	0	0	0	0
Dividends declared-preferred shares	(2,789)	0	0	0	(2,789)	0	0	0	0
Comprehensive income (loss)	50,572	0	0	0	48,642	0	1,930	0	0
Ending Balance at Sep. 30, 2023	2,046,717	175,000	5,239	5,921,778	(4,067,355)	5,053	12,055	(5,053)	$ 0
Beginning Balance at Dec. 31, 2023	2,175,543	175,000	5,239	5,923,919	(3,934,736)	5,167	6,121	(5,167)
Stock-based compensation, net	1,743	0	0	1,743	0	(230)	0	230
Dividends declared-common shares	(54,753)	0	0	0	(54,753)	0	0	0
Dividends declared-preferred shares	(5,578)	0	0	0	(5,578)	0	0	0
Comprehensive income (loss)	217,144	0	0	0	214,693	0	2,451	0
Ending Balance at Jun. 30, 2024	2,334,099	175,000	5,239	5,925,662	(3,780,374)	4,937	8,572	(4,937)
Beginning Balance at Dec. 31, 2023	2,175,543	175,000	5,239	5,923,919	(3,934,736)	5,167	6,121	(5,167)
Comprehensive income (loss)	537,638
Ending Balance at Sep. 30, 2024	2,651,926	175,000	5,247	5,927,905	(3,460,210)	4,968	6,113	(7,097)
Beginning Balance at Jun. 30, 2024	2,334,099	175,000	5,239	5,925,662	(3,780,374)	4,937	8,572	(4,937)
Stock-based compensation, net	122	0	8	2,243	0	31	0	(2,160)
Dividends declared-common shares	0	0	0	0	0	0	0	0
Dividends declared-preferred shares	(2,789)	0	0	0	(2,789)	0	0	0
Comprehensive income (loss)	320,494	0	0	0	322,953	0	(2,459)	0
Ending Balance at Sep. 30, 2024	$ 2,651,926	$ 175,000	$ 5,247	$ 5,927,905	$ (3,460,210)	$ 4,968	$ 6,113	$ (7,097)