Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost (note 1):	$ 11,495,581	$ 11,101,858
Less: accumulated depreciation	2,174,963	1,994,108
Real estate assets, net	9,320,618	9,107,750
Investments in real estate partnerships (note 4)	372,591	467,155
Properties held for sale	25,574	33,934
Cash, cash equivalents, and restricted cash, including $1,930 and $2,377 of restricted cash at December 31, 2021 and 2020, respectively (note 1)	95,027	378,450
Tenant and other receivables (note 1)	153,091	143,633
Deferred leasing costs, less accumulated amortization of $117,878 and $113,959 at December 31, 2021 and 2020, respectively	65,741	67,910
Acquired lease intangible assets, less accumulated amortization of $312,186 and $284,880 at December 31, 2021 and 2020, respectively (note 6)	212,707	188,799
Right of use assets, net	280,783	287,827
Other assets (note 5)	266,431	261,446
Total assets	10,792,563	10,936,904
Liabilities:
Notes payable (note 9)	3,718,944	3,658,405
Unsecured credit facilities (note 9)		264,679
Accounts payable and other liabilities	322,271	302,361
Acquired lease intangible liabilities, less accumulated amortization of $172,293 and $145,966 at December 31, 2021 and 2020, respectively (note 6)	363,276	377,712
Lease liabilities	215,788	220,390
Tenants’ security, escrow deposits and prepaid rent	62,352	55,210
Total liabilities	4,682,631	4,878,757
Commitments and contingencies (note 16)
Stockholders’ equity/Partners’ capital:
Common stock $0.01 par value per share, 220,000,000 shares authorized; 171,213,008 and 169,680,138 shares issued at December 31, 2021 and 2020, respectively	1,712	1,697
Treasury stock at cost, 427,901 and 459,828 shares held at December 31, 2021 and 2020, respectively	(22,758)	(24,436)
Additional paid-in capital	7,883,458	7,792,082
Accumulated other comprehensive loss	(10,227)	(18,625)
Distributions in excess of net income	(1,814,814)	(1,765,806)
Total stockholders’ equity	6,037,371	5,984,912
Noncontrolling interests (note 12):
Exchangeable operating partnership units, aggregate redemption value of $56,844 and $34,878 at December 31, 2021 and 2020, respectively	35,447	35,727
Limited partners' interests in consolidated partnerships (note 1)	37,114	37,508
Total noncontrolling interests	72,561	73,235
Total equity	6,109,932	6,058,147
Stockholders' equity/Partners' capital:
Total liabilities and equity	10,792,563	10,936,904
Partnership Interest [Member]
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost (note 1):	11,495,581	11,101,858
Less: accumulated depreciation	2,174,963	1,994,108
Real estate assets, net	9,320,618	9,107,750
Investments in real estate partnerships (note 4)	372,591	467,155
Properties held for sale	25,574	33,934
Cash, cash equivalents, and restricted cash, including $1,930 and $2,377 of restricted cash at December 31, 2021 and 2020, respectively (note 1)	95,027	378,450
Tenant and other receivables (note 1)	153,091	143,633
Deferred leasing costs, less accumulated amortization of $117,878 and $113,959 at December 31, 2021 and 2020, respectively	65,741	67,910
Acquired lease intangible assets, less accumulated amortization of $312,186 and $284,880 at December 31, 2021 and 2020, respectively (note 6)	212,707	188,799
Right of use assets, net	280,783	287,827
Other assets (note 5)	266,431	261,446
Total assets	10,792,563	10,936,904
Liabilities:
Notes payable (note 9)	3,718,944	3,658,405
Unsecured credit facilities (note 9)		264,679
Accounts payable and other liabilities	322,271	302,361
Acquired lease intangible liabilities, less accumulated amortization of $172,293 and $145,966 at December 31, 2021 and 2020, respectively (note 6)	363,276	377,712
Lease liabilities	215,788	220,390
Tenants’ security, escrow deposits and prepaid rent	62,352	55,210
Total liabilities	4,682,631	4,878,757
Commitments and contingencies (note 16)
Stockholders’ equity/Partners’ capital:
General partner; 171,213,008 and 169,680,138 units outstanding at December 31, 2021 and 2020, respectively	6,047,598	6,003,537
Limited partners; 760,046 and 765,046 units outstanding at December 31, 2021 and 2020	35,447	35,727
Accumulated other comprehensive loss	(10,227)	(18,625)
Total partners’ capital	6,072,818	6,020,639
Noncontrolling interests (note 12):
Limited partners' interests in consolidated partnerships (note 1)	37,114	37,508
Total capital	6,109,932	6,058,147
Stockholders' equity/Partners' capital:
Total liabilities and equity	$ 10,792,563	$ 10,936,904