Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Assets
Land		$ 1,987,412	$ 1,929,181
Buildings and improvements and other		12,246,988	12,065,244
Development and capital improvements in progress		295,645	283,477
Real Estate Investment Property, at Cost		14,530,045	14,277,902
Less: Accumulated depreciation		(3,625,627)	(3,415,105)
Real Estate Investment Property, Net		10,904,418	10,862,797
Investment in real estate joint venture		42,933	43,325
Real estate assets, net		10,982,401	10,967,115
Cash and cash equivalents		31,881	25,198
Restricted cash		11,123	10,417
Other assets		216,715	192,061
Total assets		11,242,120	11,194,791
Liabilities:
Unsecured notes payable		4,187,292	4,077,373
Secured notes payable		365,945	485,339
Accrued expenses and other liabilities		546,524	528,274
Total liabilities		5,099,761	5,090,986
Redeemable common stock		21,692	15,397
Operating Partnership capital:
Accumulated other comprehensive loss		(11,632)	(12,128)
Noncontrolling interests - consolidated real estate entities		16,612	9,848
Total equity		6,120,667	6,088,408
Total liabilities and equity		11,242,120	11,194,791
Limited Partner [Member]
Assets
Land		1,987,412	1,929,181
Buildings and improvements and other		12,246,988	12,065,244
Development and capital improvements in progress		295,645	283,477
Real Estate Investment Property, at Cost		14,530,045	14,277,902
Less: Accumulated depreciation		(3,625,627)	(3,415,105)
Real Estate Investment Property, Net		10,904,418	10,862,797
Undeveloped land		35,050	60,993
Investment in real estate joint venture		42,933	43,325
Real estate assets, net		10,982,401	10,967,115
Cash and cash equivalents		31,881	25,198
Restricted cash		11,123	10,417
Other assets		216,715	192,061
Total assets		11,242,120	11,194,791
Liabilities:
Unsecured notes payable		4,187,292	4,077,373
Secured notes payable		365,945	485,339
Accrued expenses and other liabilities		546,524	528,274
Due to general partner		19	19
Total liabilities		5,099,780	5,091,005
Redeemable common stock		21,692	15,397
Operating Partnership capital:
Preferred Units, Preferred Partners' Capital Accounts		66,840	66,840
General Partners' Capital Account	[1]	5,863,795	5,817,270
Limited Partners' Capital Account	[1]	185,340	206,927
Accumulated other comprehensive loss		(11,939)	(12,496)
Total operating partners’ capital		6,104,036	6,078,541
Noncontrolling interests - consolidated real estate entities		16,612	9,848
Total equity		6,120,648	6,088,389
Total liabilities and equity		$ 11,242,120	$ 11,194,791

[1] Number of units outstanding represents total OP Units regardless of classification on the Condensed Consolidated Balance Sheets. The number of units classified as redeemable common units on the Condensed Consolidated Balance Sheets as of June 30, 2021 and December 31, 2020 are 128,799 and 121,534, respectively.