CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities
Net income/(loss)	$ 67,636	$ 64,920
Adjustments to reconcile net income/(loss) to net cash provided by/(used in) operating activities:
Depreciation and amortization	314,584	233,736
(Gain)/loss on sale of real estate owned	(61,303)	(5,282)
(Income)/loss from unconsolidated entities	(11,388)	(6,674)
Return on investment in unconsolidated joint ventures	2,016	3,078
Amortization of share-based compensation	10,808	10,316
Other	8,203	6,587
Changes in operating assets and liabilities:
(Increase)/decrease in operating assets	(20,282)	(2,166)
Increase/(decrease) in operating liabilities	6,741	(18,094)
Net cash provided by/(used in) operating activities	317,015	286,421
Investing Activities
Acquisition of real estate assets	(141,727)	(730,820)
Proceeds from sales of real estate investments, net	133,934	38,000
Development of real estate assets	(63,010)	(10,333)
Capital expenditures and other major improvements - real estate assets	(64,083)	(70,240)
Capital expenditures - non-real estate assets	(7,358)	(7,147)
Investment in unconsolidated joint ventures	(20,041)	(51,874)
Distributions received from unconsolidated joint ventures	5,731	26,906
Purchase deposits on pending acquisitions		(5,250)
Repayment/(issuance) of notes receivable, net	(5,340)	4,765
Net cash provided by/(used in) investing activities	(161,894)	(805,993)
Financing Activities
Payments on secured debt	(31,621)	(1,900)
Net proceeds from the issuance of unsecured debt	211,320
Net proceeds/(repayment) of commercial paper	(115,000)	290,885
Net proceeds/(repayment) of revolving bank debt	597	33,362
Proceeds from the issuance of common shares through public offering, net		212,872
Distributions paid to redeemable noncontrolling interests	(15,782)	(16,805)
Distributions paid to preferred stockholders	(2,115)	(2,001)
Distributions paid to common stockholders	(207,095)	(185,423)
Other	(5,840)	3,714
Net cash provided by/(used in) financing activities	(165,536)	334,704
Net increase/(decrease) in cash, cash equivalents, and restricted cash	(10,415)	(184,868)
Cash, cash equivalents, and restricted cash, beginning of year	33,291	208,891
Cash, cash equivalents, and restricted cash, end of period	22,876	24,023
Supplemental Information:
Interest paid during the period, net of amounts capitalized	84,643	67,474
Cash paid/(refunds received) for income taxes	1,324	1,408
Non-cash transactions:
Transfer of investment in and advances to unconsolidated joint ventures to real estate owned	14,700	40,433
Acquisition of intellectual property in exchange for cancellation of secured note receivable	2,250
Recognition of allowance for credit losses	2,182
Recognition of operating lease right-of-use assets		94,349
Recognition of operating lease liabilities		88,336
Vesting of LTIP Units	23,018	14,742
Development costs and capital expenditures incurred but not yet paid	26,400	12,251
Conversion of Operating Partnership and DownREIT Partnership noncontrolling interests to common stock (261,196 shares in 2020 and 2,690,198 shares in 2019)	11,250	111,589
Dividends declared but not yet paid	$ 115,254	$ 105,611