CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Cash flow from operating activities:
Net income	$ 48,642		$ 66,213	$ 69,297	$ 140,577
Adjustments to reconcile net income to net cash flow provided by operating activities:
Depreciation and amortization	52,821		51,179	165,535	152,564
Stock-based compensation				5,530	5,430
Amortization and write-off of debt issuance costs and fair market value of debt adjustments				3,217	3,929
Equity in net income of joint ventures	(518)		(25,918)	(6,495)	(27,468)
Operating cash distributions from joint ventures				258	1,111
Gain on sale and change in control of interests	0	$ (3,700)	(228)	(3,749)	(45,554)
Gain on disposition of real estate, net	(31,047)		(26,837)	(31,230)	(31,292)
Impairment charges				0	2,536
Assumption of buildings due to ground lease terminations				0	(2,900)
Net change in accounts receivable				(1,180)	95
Net change in accounts payable and accrued expenses				7,323	8,025
Net change in other operating assets and liabilities				(16,457)	(1,567)
Total adjustments				122,752	64,909
Net cash flow provided by operating activities				192,049	205,486
Cash flow from investing activities:
Real estate acquired, net of liabilities and cash assumed				(102,095)	(329,570)
Real estate developed and improvements to operating real estate				(80,782)	(87,902)
Proceeds from sale of joint venture interests				3,405	39,250
Proceeds from disposition of real estate				112,292	55,866
Equity contributions to joint ventures				(118)	(143)
Repayment of joint venture advances, net				318	0
Distributions from unconsolidated joint ventures				9,468	39,656
Net cash flow used for investing activities				(57,512)	(282,843)
Cash flow from financing activities:
Proceeds from revolving credit facility, net				135,000	80,000
Proceeds from unsecured term loan				0	100,000
Payment of debt issuance costs				0	(7,598)
Repayment of senior notes				(87,209)	0
Repayment of mortgage debt				(16,224)	(35,577)
Proceeds from issuance of common shares, net of offering expenses				0	36,731
Repurchase of common shares in conjunction with equity award plans and dividend reinvestment plan				(5,224)	(5,873)
Repurchase of common shares				(26,611)	(20,000)
Repurchase of operating partnership units				(1,735)	0
Distributions to redeemable operating partnership units				(37)	(53)
Dividends paid				(90,450)	(89,523)
Net cash flow (used for) provided by financing activities				(92,490)	58,107
Net increase (decrease) in cash, cash equivalents and restricted cash				42,047	(19,250)
Cash, cash equivalents and restricted cash, beginning of period		$ 21,214		21,214	43,252	$ 43,252
Cash, cash equivalents and restricted cash, end of period	$ 63,261		$ 24,002	$ 63,261	$ 24,002	$ 21,214