Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost	$ 11,567,492	$ 11,495,581
Less: accumulated depreciation	2,235,869	2,174,963
Real estate assets, net	9,331,623	9,320,618
Investments in real estate partnerships	357,998	372,591
Properties held for sale	2,354	25,574
Cash, cash equivalents, and restricted cash, including $2,749 and $1,930 of restricted cash at March 31, 2022 and December 31, 2021, respectively	178,730	95,027		$ 378,450
Tenant and other receivables	151,852	153,091
Deferred leasing costs, less accumulated amortization of $118,572 and $117,878 at March 31, 2022 and December 31, 2021, respectively	64,954	65,741
Acquired lease intangible assets, less accumulated amortization of $316,632 and $312,186 at March 31, 2022 and December 31, 2021, respectively	205,333	212,707
Right of use assets, net	279,892	280,783
Other assets	267,428	266,431
Total assets	10,840,164	10,792,563
Liabilities:
Notes payable	3,716,717	3,718,944
Accounts payable and other liabilities	278,265	322,271
Acquired lease intangible liabilities, less accumulated amortization of $173,281 and $172,293 at March 31, 2022 and December 31, 2021, respectively	362,890	363,276
Lease liabilities	215,705	215,788
Tenants’ security, escrow deposits and prepaid rent	60,895	62,352
Total liabilities	4,634,472	4,682,631
Commitments and contingencies
Equity:
Common stock, $0.01 par value per share, 220,000,000 shares authorized; 171,372,557 and 171,213,008 shares issued at March 31, 2022 and December 31, 2021, respectively	1,714	1,712
Treasury stock at cost, 436,924 and 427,901 shares held at March 31, 2022 and December 31, 2021, respectively	(23,831)	(22,758)
Additional paid-in-capital	7,882,764	7,883,458
Accumulated other comprehensive (loss)	(1,764)	(10,227)
Distributions in excess of net income	(1,726,556)	(1,814,814)
Total stockholders’ equity	6,132,327	6,037,371
Exchangeable operating partnership units, aggregate redemption value of $54,222 and $56,844 at March 31, 2022 and December 31, 2021, respectively	35,876	35,447
Limited partners’ interests in consolidated partnerships	37,489	37,114
Total noncontrolling interests	73,365	72,561
Total equity	6,205,692	6,109,932		6,058,147
Total liabilities and equity	10,840,164	10,792,563
Partnership Interest [Member]
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost	11,567,492	11,495,581
Less: accumulated depreciation	2,235,869	2,174,963
Real estate assets, net	9,331,623	9,320,618
Investments in real estate partnerships	357,998	372,591
Properties held for sale	2,354	25,574
Cash, cash equivalents, and restricted cash, including $2,749 and $1,930 of restricted cash at March 31, 2022 and December 31, 2021, respectively	178,730	95,027		378,450
Tenant and other receivables	151,852	153,091
Deferred leasing costs, less accumulated amortization of $118,572 and $117,878 at March 31, 2022 and December 31, 2021, respectively	64,954	65,741
Acquired lease intangible assets, less accumulated amortization of $316,632 and $312,186 at March 31, 2022 and December 31, 2021, respectively	205,333	212,707
Right of use assets, net	279,892	280,783
Other assets	267,428	266,431
Total assets	10,840,164	10,792,563
Liabilities:
Notes payable	3,716,717	3,718,944
Accounts payable and other liabilities	278,265	322,271
Acquired lease intangible liabilities, less accumulated amortization of $173,281 and $172,293 at March 31, 2022 and December 31, 2021, respectively	362,890	363,276
Lease liabilities	215,705	215,788
Tenants’ security, escrow deposits and prepaid rent	60,895	62,352
Total liabilities	4,634,472	4,682,631
Commitments and contingencies
Equity:
General partner; 171,372,557 and 171,213,008 units outstanding at March 31, 2022 and December 31, 2021, respectively	6,134,091	6,047,598
Limited partners; 760,046 units outstanding at March 31, 2022 and December 31, 2021, respectively	35,876	35,447
Accumulated other comprehensive (loss)	(1,764)	(10,227)
Total partners’ capital	6,168,203	6,072,818
Limited partners’ interests in consolidated partnerships	37,489	37,114
Total capital	6,205,692	6,109,932		$ 6,058,147
Total liabilities and equity	$ 10,840,164	$ 10,792,563