Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING ACTIVITIES:
Net income (loss)	$ (67,261)	$ 74,144	$ 46,613
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Share-based compensation expense	66,051	65,273	52,675
Depreciation and amortization, including amortization of debt issuance costs	225,597	195,795	215,659
Deferred rent	(20,084)	(39,174)	(14,056)
(Income) loss from unconsolidated real estate ventures, net	20,336	1,395	(39,409)
Amortization of market lease intangibles, net	(442)	(791)	(220)
Amortization of lease incentives	6,603	6,336	3,406
Reduction of gain on bargain purchase			7,606
Loss on extinguishment of debt	62	5,805	4,536
Impairment loss	10,232
Gain on sale of real estate	(59,477)	(104,991)	(52,183)
Losses on operating lease and other receivables	25,805	1,560	3,298
Return on capital from unconsolidated real estate ventures	4,302	2,690	7,827
Other non-cash items	4,326	567	462
Impairment of corporate assets		10,170
Changes in operating assets and liabilities:
Tenant and other receivables	(9,231)	(8,382)	(5,582)
Other assets, net	(11,075)	(9,177)	(16,600)
Accounts payable and accrued expenses	591	(7,678)	(5,984)
Other liabilities, net	(27,314)	(19,556)	(19,855)
Net cash provided by operating activities	169,021	173,986	188,193
INVESTING ACTIVITIES:
Development costs, construction in progress and real estate additions	(307,497)	(441,014)	(385,943)
Acquisition of real estate	(45,688)	(165,208)	(23,246)
Deposits for real estate and other acquisitions	(25,424)	(850)
Proceeds from sale of real estate	154,493	377,511	413,077
Acquisition of interests in unconsolidated real estate ventures, net of cash acquired			(386)
Distributions of capital from unconsolidated real estate ventures	71,065	7,557	14,408
Distributions of capital from sales of unconsolidated real estate ventures			80,279
Investments in unconsolidated real estate ventures	(14,639)	(18,668)	(31,197)
Other			(665)
Net cash (used in) provided by investing activities	(167,690)	(240,672)	66,327
FINANCING ACTIVITIES:
Acquisition of interest in consolidated real estate venture			(5,550)
Finance lease payments	(3,531)	(137)	(114)
Borrowings under mortgages payable	580,105	2,200	118,141
Borrowings under revolving credit facility	500,000	200,000	35,000
Borrowings under unsecured term loans	100,000		250,000
Repayments of mortgages payable	(104,083)	(719,003)	(312,894)
Repayments of revolving credit facility	(700,000)		(150,751)
Debt issuance costs	(14,856)	(515)	(3,114)
Proceeds from the issuance of common stock, net of issuance costs		472,780
Proceeds from common stock issued pursuant to ESPP	1,715	1,457	597
Common shares repurchased	(104,774)
Dividends paid to common shareholders	(120,011)	(129,834)	(107,372)
Distributions to redeemable noncontrolling interests	(15,030)	(17,390)	(17,398)
Distributions to noncontrolling interests	(46)	(95)	(340)
Contributions from noncontrolling interests		207	250
Net cash provided by (used in) financing activities	119,489	(190,330)	(193,545)
Net increase (decrease) in cash and cash equivalents and restricted cash	120,820	(257,016)	60,975
Cash and cash equivalents and restricted cash as of the beginning of the period	142,516	399,532	338,557
Cash and cash equivalents and restricted cash as of the end of the period	263,336	142,516	399,532
SUPPLEMENTAL DISCLOSURE OF CASH FLOW AND NON-CASH INFORMATION:
Cash paid for interest (net of capitalized interest of $13,189, $29,806 and $20,804 in 2020, 2019 and 2018)	56,961	49,437	64,605
Accrued capital expenditures included in accounts payable and accrued expenses	43,188	84,076	53,073
Write-off of fully depreciated assets	30,798	66,533	52,272
Cash received for income taxes	1,187	282	1,965
Deconsolidation of properties		181,813	95,923
Accrued dividends to common shareholders	29,650	30,184	39,298
Accrued distributions to redeemable noncontrolling interests	4,425	3,828	5,896
Conversion of common limited partnership units to common shares	47,517	57,318	$ 109,208
Recognition (derecognition) of operating lease right-of-use assets	(13,151)	35,318
Recognition (derecognition) of liabilities related to operating lease right-of-use assets	(13,151)	37,922
Recognition of finance lease right-of-use assets	42,354
Recognition of liabilities related to finance lease right-of-use assets	40,684
Cash paid for amounts included in the measurement of lease liabilities for operating leases	5,201	$ 6,202
Deferred purchase price related to acquisition	$ 19,479