CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ 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 [Member]	Treasury Stock at Cost [Member]	Non-Controlling Interests [Member]
Beginning Balance at Dec. 31, 2019	$ 1,981,478	$ 325,000	$ 19,382	$ 5,700,400	$ (4,066,099)	$ 7,929	$ (491)	$ (7,707)	$ 3,064
Beginning Balance, shares at Dec. 31, 2019			193,823
Issuance of common shares related to stock plans	3,798	0	$ 18	(108)	0	0	0	3,888	0
Issuance of common shares related to stock plans, shares			172
Repurchase of common shares	(7,500)	0	$ 0	0	0	0	0	(7,500)	0
Stock-based compensation, net	2,422	0	$ 0	4,872	0	(2,450)	0		0
Stock-based compensation, net, shares			0
Distributions to non-controlling interests	(618)	0	$ 0	0	0	0	0	0	(618)
Dividends declared- common shares	(48,625)	0	0	0	(48,625)	0	0	0	0
Dividends declared- preferred shares	(20,531)	0	0	0	(20,531)	0	0	0	0
Comprehensive income (loss)	34,399	0	0	0	35,721	0	(2,191)	0	869
Ending Balance at Dec. 31, 2020	1,944,823	325,000	$ 19,400	5,705,164	(4,099,534)	5,479	(2,682)	(11,319)	3,315
Ending Balance, shares at Dec. 31, 2020			193,995
Issuance of common shares related to stock plans	263	0	$ 33	230	0	0	0	0	0
Issuance of common shares related to stock plans, shares			331
Issuance of common shares for cash offering	$ 224,974	0	$ 1,696	219,355	0	0	0	3,923	0
Issuance of common shares for cash offering, shares	17,250		16,961
Redemption of preferred shares, Value	$ (150,019)	(150,000)	$ 0	5,137	(5,156)	0	0	0	0
Redemption of preferred shares, shares			0
Stock-based compensation, net	14,752	0	$ 0	13,489	0	(784)	0	2,047	0
Stock-based compensation, net, shares			0
Distributions to non-controlling interests	(67)	0	$ 0	0	0	0	0	0	(67)
Acquisition of non-controlling interest	(7,144)	0	0	(9,209)	0				2,065
Dividends declared- common shares	(99,711)	0	0	0	(99,711)	0	0	0	0
Dividends declared- preferred shares	(13,317)	0	0	0	(13,317)	0	0	0	0
Comprehensive income (loss)	128,098	0	0	0	124,935	0	2,682	0	481
Ending Balance at Dec. 31, 2021	2,042,652	175,000	$ 21,129	5,934,166	(4,092,783)	4,695	0	(5,349)	5,794
Ending Balance, shares at Dec. 31, 2021			211,287
Issuance of common shares related to stock plans	91	0	$ 65	26	0	0	0	0	0
Issuance of common shares related to stock plans, shares			657
Issuance of common shares for cash offering	36,724	0	$ 243	36,481	0	0	0	0	0
Issuance of common shares for cash offering, shares			2,427
Repurchase of common shares	(42,256)	0	$ 0	0	0	0	0	(42,256)	0
Stock-based compensation, net	1,342	0	$ 0	4,925	0	330	0	(3,913)	0
Stock-based compensation, net, shares			0
Distributions to non-controlling interests	(73)	0	$ 0	0	0	0	0	0	(73)
Acquisition of non-controlling interest	(1,382)	0	0	(1,382)	0	0	0	0	0
Dividends declared- common shares	(111,150)	0	0	0	(111,150)	0	0	0	0
Dividends declared- preferred shares	(11,156)	0	0	0	(11,156)	0	0	0	0
Comprehensive income (loss)	177,830	0	0	0	168,719	0	9,038	0	73
Ending Balance at Dec. 31, 2022	$ 2,092,622	$ 175,000	$ 21,437	$ 5,974,216	$ (4,046,370)	$ 5,025	$ 9,038	$ (51,518)	$ 5,794
Ending Balance, shares at Dec. 31, 2022			214,371