CONSOLIDATED STATEMENTS OF BENEFICIARIES’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Rabbi Trust/Deferred Compensation Shares	Additional Paid-in Capital	Common Shares in Grantor Trust	Cumulative Earnings	Accumulated Other Comprehensive Income (Loss)	Cumulative Distributions	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2020		170,572,964	1,160,494
Beginning balance at Dec. 31, 2020	$ 1,804,648	$ 1,707	$ 17,516	$ 3,138,152	$ (17,516)	$ 1,110,083	$ (7,561)	$ (2,448,238)	$ 10,505
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	12,366					12,289			77
Other comprehensive income	5,569						5,541		28
Issuance of Common Shares of Beneficial Interest (in shares)		226,695
Issuance of Common Shares of Beneficial Interest	3,052	$ 3		3,049
Issuance of partnership interest in consolidated real estate venture	2,765								2,765
Redemption of LP Units	(2,334)								(2,334)
Share-based compensation activity (in shares)		344,656	70,645
Share-based compensation activity	6,354	$ 2		6,352
Share Issuance from/(to) Deferred Compensation Plan (in shares)		(18,058)	(61,436)
Share Issuance from/(to) Deferred Compensation Plan	(198)		$ 975	(198)	(975)
Reallocation of Noncontrolling Interest	0			(569)					569
Distributions declared	(131,003)							(130,345)	(658)
Ending balance (in shares) at Dec. 31, 2021		171,126,257	1,169,703
Ending balance at Dec. 31, 2021	1,701,219	$ 1,712	$ 18,491	3,146,786	(18,491)	1,122,372	(2,020)	(2,578,583)	10,952
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	53,992					53,824			168
Other comprehensive income	5,935						5,917		18
Redemption of LP Units	(4,006)								(4,006)
Share-based compensation activity (in shares)		469,529	85,384
Share-based compensation activity	7,718	$ 4		7,714
Share Issuance from/(to) Deferred Compensation Plan (in shares)		(25,979)	(75,444)
Share Issuance from/(to) Deferred Compensation Plan	(312)		$ 1,110	(312)	(1,110)
Reallocation of Noncontrolling Interest	(1)			(959)		(1)			959
Distributions declared	(131,211)							(130,822)	(389)
Ending balance (in shares) at Dec. 31, 2022		171,569,807	1,179,643
Ending balance at Dec. 31, 2022	1,633,334	$ 1,716	$ 19,601	3,153,229	(19,601)	1,176,195	3,897	(2,709,405)	7,702
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(197,403)					(196,789)			(614)
Other comprehensive income	(4,579)						(4,565)		(14)
Share-based compensation activity (in shares)		545,544	76,505
Share-based compensation activity	10,880	$ 3		10,877
Share Issuance from/(to) Deferred Compensation Plan (in shares)		(17,690)	(62,021)
Share Issuance from/(to) Deferred Compensation Plan	(108)		$ 364	(108)	(364)
Reallocation of Noncontrolling Interest	0			(49)					49
Distributions declared	(117,967)							(117,617)	(350)
Ending balance (in shares) at Dec. 31, 2023		172,097,661	1,194,127
Ending balance at Dec. 31, 2023	$ 1,324,157	$ 1,719	$ 19,965	$ 3,163,949	$ (19,965)	$ 979,406	$ (668)	$ (2,827,022)	$ 6,773