Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost (note 1):	$ 11,101,858	$ 11,095,294
Less: accumulated depreciation	1,994,108	1,766,162
Real estate assets, net	9,107,750	9,329,132
Investments in real estate partnerships (note 4)	467,155	469,522
Properties held for sale	33,934	45,565
Cash, cash equivalents, and restricted cash, including $2,377 and $2,542 of restricted cash at December 31, 2020 and 2019, respectively (note 1)	378,450	115,562
Tenant and other receivables (note 1)	143,633	169,337
Deferred leasing costs, less accumulated amortization of $113,959 and $108,381 at December 31, 2020 and 2019, respectively	67,910	76,798
Acquired lease intangible assets, less accumulated amortization of $284,880 and $259,310 at December 31, 2020 and 2019, respectively (note 6)	188,799	242,822
Right of use assets, net	287,827	292,786
Other assets (note 5)	261,446	390,729
Total assets	10,936,904	11,132,253
Liabilities:
Notes payable (note 9)	3,658,405	3,435,161
Unsecured credit facilities (note 9)	264,679	484,383
Accounts payable and other liabilities	302,361	213,705
Acquired lease intangible liabilities, less accumulated amortization of $145,966 and $131,676 at December 31, 2020 and 2019, respectively (note 6)	377,712	427,260
Lease liabilities	220,390	222,918
Tenants’ security, escrow deposits and prepaid rent	55,210	58,865
Total liabilities	4,878,757	4,842,292
Commitments and contingencies (note 16)	0	0
Stockholders’ equity/Partners’ capital:
Common stock $0.01 par value per share, 220,000,000 shares authorized; 169,680,138 and 167,571,218 shares issued at December 31, 2020 and 2019, respectively	1,697	1,676
Treasury stock at cost, 459,828 and 440,574 shares held at December 31, 2020 and 2019, respectively	(24,436)	(23,199)
Additional paid-in capital	7,792,082	7,654,930
Accumulated other comprehensive loss	(18,625)	(11,997)
Distributions in excess of net income	(1,765,806)	(1,408,062)
Total stockholders’ equity	5,984,912	6,213,348
Noncontrolling interests (note 12):
Exchangeable operating partnership units, aggregate redemption value of $34,878 and $47,092 at December 31, 2020 and 2019, respectively	35,727	36,100
Limited partners’ interests in consolidated partnerships (note 1)	37,508	40,513
Total noncontrolling interests	73,235	76,613
Total equity	6,058,147	6,289,961
Total liabilities and equity	10,936,904	11,132,253
Partnership Interest [Member]
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost (note 1):	11,101,858	11,095,294
Less: accumulated depreciation	1,994,108	1,766,162
Real estate assets, net	9,107,750	9,329,132
Investments in real estate partnerships (note 4)	467,155	469,522
Properties held for sale	33,934	45,565
Cash, cash equivalents, and restricted cash, including $2,377 and $2,542 of restricted cash at December 31, 2020 and 2019, respectively (note 1)	378,450	115,562
Tenant and other receivables (note 1)	143,633	169,337
Deferred leasing costs, less accumulated amortization of $113,959 and $108,381 at December 31, 2020 and 2019, respectively	67,910	76,798
Acquired lease intangible assets, less accumulated amortization of $284,880 and $259,310 at December 31, 2020 and 2019, respectively (note 6)	188,799	242,822
Right of use assets, net	287,827	292,786
Other assets (note 5)	261,446	390,729
Total assets	10,936,904	11,132,253
Liabilities:
Notes payable (note 9)	3,658,405	3,435,161
Unsecured credit facilities (note 9)	264,679	484,383
Accounts payable and other liabilities	302,361	213,705
Acquired lease intangible liabilities, less accumulated amortization of $145,966 and $131,676 at December 31, 2020 and 2019, respectively (note 6)	377,712	427,260
Lease liabilities	220,390	222,918
Tenants’ security, escrow deposits and prepaid rent	55,210	58,865
Total liabilities	4,878,757	4,842,292
Commitments and contingencies (note 16)	0	0
Stockholders’ equity/Partners’ capital:
General partner; 167,904,593 and 171,364,908 units outstanding at December 31, 2019 and 2018, respectively	6,003,537	6,225,345
Limited partners; 349,902 units outstanding at December 31, 2019 and 2018	35,727	36,100
Accumulated other comprehensive loss	(18,625)	(11,997)
Total partners’ capital	6,020,639	6,249,448
Noncontrolling interests (note 12):
Limited partners’ interests in consolidated partnerships (note 1)	37,508	40,513
Total capital	6,058,147	6,289,961
Total liabilities and equity	$ 10,936,904	$ 11,132,253