CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ 60,061	$ 1,073,474	$ 422,634
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization of real estate, in-place lease and other intangibles	659,989	549,499	534,726
Amortization of deferred compensation	18,162	16,563	14,258
Amortization of deferred financing costs	10,863	12,612	14,569
Straight-line rents	(22,479)	(23,138)	(23,933)
Equity loss (income) from unconsolidated joint ventures	8,625	2,594	(10,901)
Distributions of earnings from unconsolidated joint ventures	20,114	22,467	44,142
Non-cash lease and management fee termination loss (income), net	0	0	54,641
Deferred income tax expense (benefit)	(18,253)	(18,525)	(5,523)
Impairments (recoveries), net	225,937	55,260	166,384
Loss on extinguishment of debt	58,364	44,162	54,227
Loss (gain) on sales of real estate, net	(22,900)	(925,985)	(356,641)
Loss (gain) on consolidation, net	(168,023)	(9,154)	0
Casualty-related loss (recoveries), net	(3,706)	0	12,053
Loss (gain) on sale of marketable securities	0	0	(50,895)
Other non-cash items	(2,569)	2,569	(2,735)
Decrease (increase) in accounts receivable and other assets, net	(49,771)	5,686	(24,782)
Increase (decrease) in accounts payable, accrued liabilities and deferred revenue	71,659	40,625	4,817
Net cash provided by (used in) operating activities	846,073	848,709	847,041
Cash flows from investing activities:
Acquisitions of real estate	(1,604,285)	(426,080)	(560,753)
Development, redevelopment, and other major improvements of real estate	(626,904)	(503,643)	(373,479)
Leasing costs, tenant improvements, and recurring capital expenditures	(108,844)	(106,193)	(115,260)
Proceeds from sales of real estate, net	230,455	2,044,477	1,314,325
Contributions to unconsolidated joint ventures	(14,956)	(12,203)	(46,334)
Distributions in excess of earnings from unconsolidated joint ventures	27,072	26,472	37,023
Proceeds from insurance recovery	9,359	0	0
Proceeds from the RIDEA II transaction, net	0	335,709	462,242
Proceeds from the U.K. JV transaction, net	(89,868)	(393,997)	0
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates	354,774	0	0
Proceeds from sales/principal repayments on debt investments and direct financing leases	274,150	148,024	558,769
Investments in loans receivable, direct financing leases and other	(79,467)	(71,281)	(30,276)
Net cash provided by (used in) investing activities	(1,448,778)	1,829,279	1,246,257
Cash flows from financing activities:
Borrowings under bank line of credit and commercial paper	7,607,788	1,823,000	1,244,189
Repayments under bank line of credit and commercial paper	(7,597,047)	(2,755,668)	(1,150,596)
Issuance and borrowings of debt, excluding bank line of credit and commercial paper	2,047,069	223,587	5,395
Repayments and repurchase of debt, excluding bank line of credit and commercial paper	(1,654,142)	(1,604,026)	(1,468,446)
Borrowings under term loan	250,000	0	0
Payments for debt extinguishment and deferred financing costs	(80,616)	(41,552)	(51,415)
Issuance of common stock and exercise of options	795,586	217,656	28,121
Repurchase of common stock	(5,043)	(3,432)	(4,785)
Dividends paid on common stock	(720,123)	(696,913)	(694,955)
Issuance of noncontrolling interests	33,318	299,666	1,615
Distributions to and purchase of noncontrolling interests	(29,519)	(82,854)	(57,584)
Net cash provided by (used in) financing activities	647,271	(2,620,536)	(2,148,461)
Effect of foreign exchanges on cash, cash equivalents and restricted cash	245	191	376
Net increase (decrease) in cash, cash equivalents and restricted cash	44,811	57,643	(54,787)
Cash, cash equivalents and restricted cash, beginning of year	139,846	82,203	136,990
Cash, cash equivalents and restricted cash, end of year	$ 184,657	$ 139,846	$ 82,203