CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 431,448	$ 337,589
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	328,997	367,764
Amortization of stock-based compensation	9,459	8,972
Amortization of deferred financing costs	4,334	5,116
Straight-line rents	(15,336)	(14,544)
Amortization of nonrefundable entrance fees and above/below market lease intangibles	(45,842)	(37,043)
Equity loss (income) from unconsolidated joint ventures	(7,100)	29,065
Distributions of earnings from unconsolidated joint ventures	4,015	11,594
Loss (gain) on sale of real estate under direct financing leases	0	(41,670)
Deferred income tax expense (benefit)	(2,538)	(31,947)
Impairments and loan loss reserves (recoveries), net	15,168	63,173
Loss (gain) on debt extinguishments	225,157	24,991
Loss (gain) on sales of real estate, net	(557,138)	(247,732)
Loss (gain) upon change of control, net	(1,042)	(169,962)
Casualty-related loss (recoveries), net	1,061	0
Other non-cash items	(8,057)	127
Decrease (increase) in accounts receivable and other assets, net	32,928	13,117
Increase (decrease) in accounts payable, accrued liabilities, and deferred revenue	(55,920)	1,213
Net cash provided by (used in) operating activities	359,594	319,823
Cash flows from investing activities:
Acquisitions of real estate	(498,142)	(300,954)
Development, redevelopment, and other major improvements of real estate	(281,829)	(391,230)
Leasing costs, tenant improvements, and recurring capital expenditures	(43,132)	(40,572)
Proceeds from sales of real estate, net	2,253,889	548,858
Acquisition of CCRC Portfolio	0	(390,599)
Contributions to unconsolidated joint ventures	(10,168)	(1,983)
Distributions in excess of earnings from unconsolidated joint ventures	34,586	3,251
Proceeds from sales/principal repayments on loans receivable and direct financing leases	265,934	109,920
Investments in loans receivable and other	(8,842)	(71,961)
Net cash provided by (used in) investing activities	1,712,296	(535,270)
Cash flows from financing activities:
Borrowings under bank line of credit and commercial paper	8,177,450	2,025,600
Repayments under bank line of credit and commercial paper	(7,587,040)	(2,118,600)
Issuance and borrowings of debt, excluding bank line of credit and commercial paper	142,100	594,750
Repayments and repurchase of debt, excluding bank line of credit and commercial paper	(2,170,170)	(257,511)
Payments for debt extinguishment and deferred financing costs	(217,468)	(30,508)
Issuance of common stock and exercise of options	1,170	1,067,195
Repurchase of common stock	(12,480)	(9,998)
Dividends paid on common stock	(326,089)	(388,050)
Distributions to and purchase of noncontrolling interests	(16,745)	(15,294)
Net cash provided by (used in) financing activities	(2,009,272)	867,584
Effect of foreign exchanges on cash, cash equivalents and restricted cash	0	(153)
Net increase (decrease) in cash, cash equivalents and restricted cash	62,618	651,984
Cash, cash equivalents and restricted cash, beginning of period	181,685	184,657
Cash, cash equivalents and restricted cash, end of period	$ 244,303	$ 836,641