CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ 516,424	$ 525,930	$ 428,253
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization of real estate, in-place lease, and other intangibles	710,569	684,286	697,143
Stock-based compensation amortization expense	26,456	18,202	17,368
Amortization of deferred financing costs	10,881	9,216	10,157
Straight-line rents	(49,183)	(31,188)	(24,532)
Amortization of nonrefundable entrance fees and above/below market lease intangibles	(102,747)	(94,362)	(81,914)
Equity loss (income) from unconsolidated joint ventures	(2,049)	(11,235)	67,787
Distributions of earnings from unconsolidated joint ventures	943	4,976	12,294
Loss (gain) on sale of real estate under direct financing leases	(22,693)	0	(41,670)
Deferred income tax expense (benefit)	(6,001)	(5,792)	(14,573)
Impairments and loan loss reserves (recoveries), net	7,004	55,896	244,253
Loss (gain) on debt extinguishments	0	225,824	42,912
Loss (gain) on sales of real estate, net	(10,422)	(605,311)	(550,494)
Loss (gain) upon change of control, net	(311,438)	(1,042)	(159,973)
Casualty-related loss (recoveries), net	7,168	1,632	469
Other non-cash items	6,489	(8,178)	2,175
Changes in:
Decrease (increase) in accounts receivable and other assets, net	(17,433)	18,626	15,281
Increase (decrease) in accounts payable, accrued liabilities, and deferred revenue	136,293	7,768	93,495
Net cash provided by (used in) operating activities	900,261	795,248	758,431
Cash flows from investing activities:
Acquisitions of real estate	(178,133)	(1,483,026)	(1,170,651)
Development, redevelopment, and other major improvements of real estate	(861,636)	(610,555)	(791,566)
Leasing costs, tenant improvements, and recurring capital expenditures	(108,510)	(111,480)	(94,121)
Proceeds from sales of real estate, net	47,885	2,399,120	1,304,375
Proceeds from the South San Francisco JVs transaction, net	125,985	0	0
Acquisition of CCRC Portfolio	0	0	(394,177)
Contributions to unconsolidated joint ventures	(21,143)	(25,260)	(39,118)
Distributions in excess of earnings from unconsolidated joint ventures	12,518	37,640	18,555
Proceeds from insurance recovery	1,450	0	1,802
Proceeds from sales/principal repayments on loans receivable and direct financing leases	115,988	342,420	202,763
Investments in loans receivable and other	(10,747)	(17,827)	(45,562)
Net cash provided by (used in) investing activities	(876,343)	531,032	(1,007,700)
Cash flows from financing activities:
Borrowings under bank line of credit and commercial paper	15,882,153	16,821,450	4,742,600
Repayments under bank line of credit and commercial paper	(16,052,522)	(15,785,065)	(4,706,010)
Issuances and borrowings of term loans, senior unsecured notes, and mortgage debt	500,000	1,088,537	594,750
Repayments and repurchases of term loans, senior unsecured notes, and mortgage debt	(5,048)	(2,425,936)	(568,343)
Payments for debt extinguishment and deferred financing costs	(4,171)	(236,942)	(47,210)
Issuance of common stock and exercise of options, net of offering costs	308,100	5,036	1,068,877
Repurchase of common stock	(67,838)	(12,841)	(10,529)
Dividends paid on common stock	(648,047)	(650,082)	(787,072)
Distributions to and purchase of noncontrolling interests	(30,549)	(93,314)	(40,613)
Contributions from and issuance of noncontrolling interests	1,390	640	0
Net cash provided by (used in) financing activities	(116,532)	(1,288,517)	246,450
Effect of foreign exchanges on cash, cash equivalents and restricted cash	0	0	(153)
Net increase (decrease) in cash, cash equivalents and restricted cash	(92,614)	37,763	(2,972)
Cash, cash equivalents and restricted cash, beginning of year	219,448	181,685	184,657
Cash, cash equivalents and restricted cash, end of year	$ 126,834	$ 219,448	$ 181,685