Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Operating Activities
Net loss	$ (21,694)	$ 12,211	$ (439,279)	$ (12,253)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization			204,171	148,267
Equity in net loss from unconsolidated joint ventures	15,126	21,997	44,470	31,262
Distributions of cumulative earnings from unconsolidated joint ventures			514	448
Equity in net loss on sale of interest in unconsolidated joint venture interest/real estate	0	0	79	131
Purchase price and other fair value adjustments			6,987	7,348
Depreciable real estate reserves and impairment			305,527	0
Loss on sale of real estate, net	(516)	(4,276)	27,813	61,104
Loan loss reserves and other investment reserves, net of recoveries	0	0	6,890	0	$ 0
Deferred rents receivable			(16,195)	(1,371)
Non-cash lease expense			15,477	17,332
Other non-cash adjustments			6,645	(11,950)
Changes in operating assets and liabilities:
Tenant and other receivables			(2,852)	7,800
Related party receivables			16,466	5,803
Deferred lease costs			(8,066)	(10,227)
Other assets			(13,254)	(35,114)
Accounts payable, accrued expenses, other liabilities and security deposits			23,655	21,345
Deferred revenue			9,978	17,208
Lease liability - operating leases			(7,688)	2,495
Net cash provided by operating activities			181,338	249,628
Investing Activities
Acquisitions of real estate property			0	(64,491)
Additions to land, buildings and improvements			(194,035)	(194,997)
Acquisition deposits and deferred purchase price			0	75,400
Investments in unconsolidated joint ventures			(119,522)	(146,598)
Distributions in excess of cumulative earnings from unconsolidated joint ventures			108,884	92,217
Net proceeds from disposition of real estate/joint venture interest			547,605	353,853
Cash and restricted cash assumed from acquisition of real estate investment			0	60,494
Proceeds from sale or redemption of marketable securities			0	11,465
Other investments			(17,545)	1,619
Origination of debt and preferred equity investments			(53,703)	(40,053)
Repayments or redemption of debt and preferred equity investments			0	124,405
Net cash provided by investing activities			271,684	273,314
Financing Activities
Proceeds from mortgages and other loans payable			0	381,980
Repayments of mortgages and other loans payable			(4,340)	(290,936)
Proceeds from revolving credit facility, term loans and unsecured notes			358,000	1,124,000
Repayments of revolving credit facility, term loans and unsecured notes			(808,000)	(1,364,000)
Proceeds from stock options exercised and DRSPP issuance			439	339
Repurchase of common stock			0	(151,197)
Redemption of preferred stock			(11,700)	(17,967)
Redemption of OP units			(8,900)	(35,316)
Distributions to noncontrolling interests in other partnerships			(1,614)	(3,168)
Contributions from noncontrolling interests in other partnerships			3,580	52,164
Acquisition of subsidiary interest from noncontrolling interest			0	(29,817)
Distributions to noncontrolling interests in the Operating Partnership			(11,225)	(12,635)
Dividends paid on common and preferred stock			(172,920)	(197,124)
Other obligations related to secured borrowing			129,656	77,874
Tax withholdings related to restricted share awards			0	(3,915)
Deferred loan costs			(729)	(5,130)
Net cash used in financing activities			(527,753)	(474,848)
Net (decrease) increase in cash, cash equivalents, and restricted cash			(74,731)	48,094
Cash, cash equivalents, and restricted cash at beginning of year			384,054	336,984	336,984
Cash, cash equivalents, and restricted cash at end of period	309,323	385,078	309,323	385,078	384,054
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Exchange of preferred equity investment for real estate or equity in joint venture			0	190,652
Exchange of debt investment for real estate or equity in joint venture			349,946	193,995
Assumption of mortgage and mezzanine loans			0	1,712,750
Issuance of special dividend paid primarily in stock			0	160,620
Tenant improvements and capital expenditures payable			0	18,518
Fair value adjustment to noncontrolling interest in the Operating Partnership			8,072	23,539
Deconsolidation of a subsidiary			101,351	0
Contribution to consolidated joint venture interest			8,134	0
Debt and preferred equity investments			0	302
Removal of fully depreciated commercial real estate properties			7,747	4,048
Recognition of right of use assets and related lease liabilities			0	57,938
Cash and cash equivalents	189,750	201,267	189,750	201,267	203,273
Restricted cash	119,573	183,811	119,573	183,811	180,781
Total cash, cash equivalents, and restricted cash	$ 309,323	$ 385,078	$ 309,323	$ 385,078	$ 384,054