CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net (loss) income	$ (245,462)	$ 102,554	$ 68,972
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Loss on extinguishment of debt	0	351	0
Loss on remeasurement of assets	163,298	0	0
Loss on sale or write down of assets, net	68,112	11,909	31,825
Depreciation and amortization	326,058	337,667	334,682
Amortization of net premium on mortgage notes payable	(773)	(929)	(929)
Amortization of share and unit-based plans	13,843	12,032	27,367
Straight-line rent and amortization of above and below market leases	(23,707)	(14,009)	(13,701)
Provision for doubtful accounts	44,250	7,682	4,663
Income tax (benefit) expense	(447)	1,589	(3,604)
Equity in loss (income) of unconsolidated joint ventures	27,038	(48,508)	(71,773)
Change in fair value of financing arrangement obligation	(139,522)	(76,640)	(15,225)
Distributions of income from unconsolidated joint ventures	0	934	1,959
Changes in assets and liabilities, net of acquisitions and dispositions:
Tenant and other receivables	(105,947)	(9,929)	(13,912)
Other assets	810	(9,553)	8,439
Due from affiliates	3,385	13,894	(3,019)
Accounts payable and accrued expenses	15,479	(237)	(2,159)
Other accrued liabilities	(21,578)	26,350	(9,274)
Net cash provided by operating activities	124,837	355,157	344,311
Cash flows from investing activities:
Development, redevelopment, expansion and renovation of properties	(45,161)	(166,791)	(181,089)
Property improvements	(23,143)	(21,114)	(56,142)
Proceeds from collection of notes receivable	0	68,819	1,043
Deferred leasing costs	(3,212)	(11,906)	(28,769)
Distributions from unconsolidated joint ventures	78,427	266,349	536,643
Contributions to unconsolidated joint ventures	(132,466)	(252,903)	(181,239)
Cash and restricted cash acquired from acquisition of previously unconsolidated joint venture	5,811	0	0
Loan to previously unconsolidated joint venture	(100,000)	0	0
Proceeds from sale of assets	16,896	5,520	85,876
Net cash (used in) provided by investing activities	(202,848)	(112,026)	176,323
Cash flows from financing activities:
Proceeds from mortgages, bank and other notes payable	660,000	1,796,000	415,000
Payments on mortgages, bank and other notes payable	(33,972)	(1,567,089)	(469,814)
Deferred financing costs	(4,320)	(7,759)	(275)
Payment of finance deposits, net of refunds received	0	0	(6,542)
Payment on finance arrangement obligation	0	(27,945)	0
Proceeds from finance lease	4,115	0
Payments on finance leases	(1,534)	(1,472)
Proceeds from share and unit-based plans	1,531	1,519	1,570
Redemption of noncontrolling interests	(29)	(67)	(759)
Contributions from noncontrolling interests	525	3,131	16
Dividends and distributions	(179,862)	(474,534)	(453,634)
Net cash provided by (used in) financing activities	446,454	(278,216)	(514,438)
Net increase (decrease) in cash, cash equivalents and restricted cash	368,443	(35,085)	6,196
Cash, cash equivalents and restricted cash at beginning of year	114,216	149,301	143,105
Cash, cash equivalents, and restricted cash at end of year	482,659	114,216	149,301
Supplemental cash flow information:
Cash payments for interest, net of amounts capitalized	199,147	210,026	192,254
Non-cash investing and financing activities:
Accrued development costs included in accounts payable and accrued expenses and other accrued liabilities	29,376	32,452	50,006
Conversion of Operating Partnership Units to common stock	12,086	1,005	75
Lease liabilities recorded in connection with right-of-use assets	0	109,299
Mortgage notes payable assumed by buyer in exchange for investment in unconsolidated joint venture	0	0	139,249
Disposition of property in exchange for investments in unconsolidated joint ventures	0	0	25,177
Joint venture
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Equity in loss (income) of unconsolidated joint ventures	27,038	(48,508)	(71,773)
Disposition of property in exchange for investments in unconsolidated joint ventures	19,300	0	0
Assets acquired from previously unconsolidated joint venture	395,844	0	0
Liabilities assumed from previously unconsolidated joint venture	$ 263,393	$ 0	$ 0