Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Operating (including $2,188,736 and $1,703,202 of consolidated variable interest entities, respectively)	$ 8,730,079	$ 7,771,981
Construction-in-progress (including $28,277 and $44,896 of consolidated variable interest entities, respectively)	662,643	810,889
Real estate, at cost, total	9,392,722	8,582,870
Less accumulated depreciation and amortization (including $374,970 and $335,735 of consolidated variable interest entities, respectively)	(2,501,622)	(2,357,692)
Net real estate	6,891,100	6,225,178
Cash and cash equivalents	177,591	798,329
Accounts and notes receivable, net	159,840	159,780
Mortgage notes receivable, net	9,521	39,892
Investment in partnerships	12,079	22,128
Operating lease right of use assets	91,836	92,248
Finance lease right of use assets	50,153	51,116
Prepaid expenses and other assets	242,322	218,953
TOTAL ASSETS	7,634,442	7,607,624
Liabilities
Mortgages payable, net (including $388,489 and $413,681 of consolidated variable interest entities, respectively)	457,203	484,111
Notes payable, net	301,462	402,776
Senior notes and debentures, net	3,405,685	3,404,488
Accounts payable and accrued expenses	244,272	228,641
Dividends payable	85,680	83,839
Security deposits payable	24,933	20,388
Operating lease liabilities	73,609	72,441
Finance lease liabilities	72,037	72,049
Other liabilities and deferred credits	210,429	152,424
Total liabilities	4,875,310	4,921,157
Commitments and contingencies (Note 6)
Redeemable noncontrolling interests	212,950	137,720
Shareholders’ equity
Common shares of beneficial interest, $.01 par, 100,000,000 shares authorized, 77,774,645 and 76,727,394 shares issued and outstanding, respectively	782	771
Additional paid-in capital	3,398,851	3,297,305
Accumulated dividends in excess of net income	(1,095,741)	(988,272)
Accumulated other comprehensive loss	(2,726)	(5,644)
Total shareholders’ equity of the Trust	2,461,163	2,464,157
Noncontrolling interests	85,019	84,590
Total shareholders’ equity	2,546,182	2,548,747
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	7,634,442	7,607,624
5.0% Series C Cumulative Redeemable Preferred Shares, (stated at liquidation preference $25,000 per share), 6,000 shares issued and outstanding
Shareholders’ equity
Preferred shares, authorized 15,000,000 shares, $.01 par:	150,000	150,000
5.417% Series 1 Cumulative Convertible Preferred Shares, (stated at liquidation preference $25 per share), 399,896 shares issued and outstanding
Shareholders’ equity
Preferred shares, authorized 15,000,000 shares, $.01 par:	$ 9,997	$ 9,997