Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost	$ 11,123,004	$ 11,101,858
Less: accumulated depreciation	2,106,958	1,994,108
Real estate assets, net	9,016,046	9,107,750
Investments in real estate partnerships	409,627	467,155
Properties held for sale		33,934
Cash, cash equivalents, and restricted cash, including $2,580 and $2,377 of restricted cash at June 30, 2021 and December 31, 2020, respectively	286,613	378,450
Tenant and other receivables	131,510	143,633
Deferred leasing costs, less accumulated amortization of $115,396 and $113,959 at June 30, 2021 and December 31, 2020, respectively	66,604	67,910
Acquired lease intangible assets, less accumulated amortization of $298,377 and $284,880 at June 30, 2021 and December 31, 2020, respectively	169,119	188,799
Right of use assets, net	284,440	287,827
Other assets	276,207	261,446
Total assets	10,640,166	10,936,904
Less: accumulated depreciation	2,106,958	1,994,108
Real estate assets, net	9,016,046	9,107,750
Liabilities:
Notes payable	3,650,307	3,658,405
Unsecured credit facilities		264,679
Accounts payable and other liabilities	313,896	302,361
Acquired lease intangible liabilities, less accumulated amortization of $159,554 and $145,966 at June 30, 2021 and December 31, 2020, respectively	361,959	377,712
Lease liabilities	218,069	220,390
Tenants’ security, escrow deposits and prepaid rent	55,904	55,210
Total liabilities	4,600,135	4,878,757
Commitments and contingencies
Equity:
Common stock, $0.01 par value per share, 220,000,000 shares authorized; 169,867,162 and 169,680,138 shares issued at June 30, 2021 and December 31, 2020, respectively	1,699	1,697
Treasury stock at cost, 466,469 and 440,574 shares held at September 30, 2020 and December 31, 2019, respectively	(25,887)	(24,436)
Additional paid-in-capital	7,796,699	7,792,082
Accumulated other comprehensive loss	(13,658)	(18,625)
Distributions in excess of net income	(1,791,773)	(1,765,806)
Total stockholders’ equity	5,967,080	5,984,912
Exchangeable operating partnership units, aggregate redemption value of $48,696 and $34,878 at June 30, 2021 and December 31, 2020, respectively	35,544	35,727
Limited partners’ interests in consolidated partnerships	37,407	37,508
Total noncontrolling interests	72,951	73,235
Total equity	6,040,031	6,058,147
Total equity	6,040,031	6,058,147
Total liabilities and equity	10,640,166	10,936,904
Partnership Interest [Member]
Real Estate Investment Property, at Cost [Abstract]
Real estate assets, at cost	11,123,004	11,101,858
Less: accumulated depreciation	2,106,958	1,994,108
Real estate assets, net	9,016,046	9,107,750
Investments in real estate partnerships	409,627	467,155
Properties held for sale		33,934
Cash, cash equivalents, and restricted cash, including $2,580 and $2,377 of restricted cash at June 30, 2021 and December 31, 2020, respectively	286,613	378,450
Tenant and other receivables	131,510	143,633
Deferred leasing costs, less accumulated amortization of $115,396 and $113,959 at June 30, 2021 and December 31, 2020, respectively	66,604	67,910
Acquired lease intangible assets, less accumulated amortization of $298,377 and $284,880 at June 30, 2021 and December 31, 2020, respectively	169,119	188,799
Right of use assets, net	284,440	287,827
Other assets	276,207	261,446
Total assets	10,640,166	10,936,904
Less: accumulated depreciation	2,106,958	1,994,108
Real estate assets, net	9,016,046	9,107,750
Liabilities:
Notes payable	3,650,307	3,658,405
Unsecured credit facilities		264,679
Accounts payable and other liabilities	313,896	302,361
Acquired lease intangible liabilities, less accumulated amortization of $159,554 and $145,966 at June 30, 2021 and December 31, 2020, respectively	361,959	377,712
Lease liabilities	218,069	220,390
Tenants’ security, escrow deposits and prepaid rent	55,904	55,210
Total liabilities	4,600,135	4,878,757
Commitments and contingencies
Equity:
General partner; 169,677,302 and 167,571,218 units outstanding at September 30, 2020 and December 31, 2019, respectively	5,980,738	6,003,537
Limited partners; 765,046 and 746,433 units outstanding at September?30, 2020 and December?31, 2019, respectively	35,544	35,727
Accumulated other comprehensive loss	(13,658)	(18,625)
Total partners’ capital	6,002,624	6,020,639
Limited partners’ interests in consolidated partnerships	37,407	37,508
Total capital	6,040,031	6,058,147
Total capital	6,040,031	6,058,147
Total liabilities and equity	$ 10,640,166	$ 10,936,904