Schedule III - Real Estate and Accumulated Depreciation - Assets Held for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	$ 2,129,954
Initial cost of land and land improvements	3,760,148
Initial cost of building and improvements	30,524,134
Cost Capitalized Subsequent to Acquisition	6,781,997
Carrying amount of land and land improvements	4,249,834
Carrying amount of building and improvements	36,750,932
Accumulated depreciation	8,075,733	$ 6,910,114	$ 6,104,297	$ 5,715,459
Assets held for sale
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	14,357
Initial cost of building and improvements	177,403
Cost Capitalized Subsequent to Acquisition	6,811
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	133,058
Accumulated depreciation	0
Assets held for sale | Brookline, MA
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	0
Initial cost of building and improvements	0
Cost Capitalized Subsequent to Acquisition	3,799
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	3,799
Accumulated depreciation	0
Assets held for sale | Centreville, MD
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	600
Initial cost of building and improvements	14,602
Cost Capitalized Subsequent to Acquisition	0
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	10,539
Accumulated depreciation	0
Assets held for sale | Dundalk, MD
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	1,770
Initial cost of building and improvements	32,047
Cost Capitalized Subsequent to Acquisition	0
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	24,213
Accumulated depreciation	0
Assets held for sale | Fort Worth, TX
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	1,740
Initial cost of building and improvements	19,799
Cost Capitalized Subsequent to Acquisition	0
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	5,091
Accumulated depreciation	0
Assets held for sale | LaPlata, MD
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	700
Initial cost of building and improvements	19,068
Cost Capitalized Subsequent to Acquisition	0
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	13,891
Accumulated depreciation	0
Assets held for sale | Las Vegas, NV
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	0
Initial cost of building and improvements	0
Cost Capitalized Subsequent to Acquisition	2,945
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	2,945
Accumulated depreciation	0
Assets held for sale | Rexburg, ID
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	0
Initial cost of building and improvements	0
Cost Capitalized Subsequent to Acquisition	67
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	67
Accumulated depreciation	0
Assets held for sale | Santa Ana, CA
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	2,077
Initial cost of building and improvements	4,705
Cost Capitalized Subsequent to Acquisition	0
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	4,705
Accumulated depreciation	0
Assets held for sale | Severna Park, MD
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	2,120
Initial cost of building and improvements	31,273
Cost Capitalized Subsequent to Acquisition	0
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	24,207
Accumulated depreciation	0
Assets held for sale | Towson, MD
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	1,180
Initial cost of building and improvements	13,280
Cost Capitalized Subsequent to Acquisition	0
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	10
Accumulated depreciation	0
Assets held for sale | Voorhees, NJ
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	1,900
Initial cost of building and improvements	26,040
Cost Capitalized Subsequent to Acquisition	0
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	20
Accumulated depreciation	0
Assets held for sale | Westfield, NJ
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Initial cost of encumbrances	0
Initial cost of land and land improvements	2,270
Initial cost of building and improvements	16,589
Cost Capitalized Subsequent to Acquisition	0
Carrying amount of land and land improvements	0
Carrying amount of building and improvements	13,314
Accumulated depreciation	$ 0