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Schedule III - Summary of Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 339,993      
Initial cost to company, Land 1,585,097      
Initial cost to company, Buildings and Improvements 2,725,032      
Cost Capitalized Subsequent to Acquisition 5,111,933      
Gross amount at which carried at close of period, Land 1,578,280      
Gross amount at which carried at close of period, Buildings and Improvements 7,843,782      
Gross amount at which carried at close of period, Total 9,422,062 [1] $ 8,582,870 $ 8,298,132 $ 7,819,472
Accumulated Depreciation and Amortization $ 2,531,095 $ 2,357,692 $ 2,215,413 $ 2,059,143
Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on  which depreciation in latest income statements is computed 50 years      
29th Place        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 10,211      
Initial cost to company, Buildings and Improvements 18,863      
Cost Capitalized Subsequent to Acquisition 11,035      
Gross amount at which carried at close of period, Land 10,195      
Gross amount at which carried at close of period, Buildings and Improvements 29,914      
Gross amount at which carried at close of period, Total 40,109      
Accumulated Depreciation and Amortization 15,312      
Andorra        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 2,432      
Initial cost to company, Buildings and Improvements 12,346      
Cost Capitalized Subsequent to Acquisition 18,458      
Gross amount at which carried at close of period, Land 2,432      
Gross amount at which carried at close of period, Buildings and Improvements 30,804      
Gross amount at which carried at close of period, Total 33,236      
Accumulated Depreciation and Amortization 22,053      
Assembly Row/Assembly Square Market Place        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 93,252      
Initial cost to company, Buildings and Improvements 34,196      
Cost Capitalized Subsequent to Acquisition 951,169      
Gross amount at which carried at close of period, Land 69,421      
Gross amount at which carried at close of period, Buildings and Improvements 1,009,196      
Gross amount at which carried at close of period, Total 1,078,617      
Accumulated Depreciation and Amortization 107,931      
Azalea        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 39,800      
Initial cost to company, Land 40,219      
Initial cost to company, Buildings and Improvements 67,117      
Cost Capitalized Subsequent to Acquisition 628      
Gross amount at which carried at close of period, Land 40,219      
Gross amount at which carried at close of period, Buildings and Improvements 67,745      
Gross amount at which carried at close of period, Total 107,964      
Accumulated Depreciation and Amortization 11,036      
Bala Cynwyd        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 3,565      
Initial cost to company, Buildings and Improvements 14,466      
Cost Capitalized Subsequent to Acquisition 48,471      
Gross amount at which carried at close of period, Land 2,683      
Gross amount at which carried at close of period, Buildings and Improvements 63,819      
Gross amount at which carried at close of period, Total 66,502      
Accumulated Depreciation and Amortization 29,407      
Barcroft Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 12,617      
Initial cost to company, Buildings and Improvements 29,603      
Cost Capitalized Subsequent to Acquisition 7,968      
Gross amount at which carried at close of period, Land 12,617      
Gross amount at which carried at close of period, Buildings and Improvements 37,571      
Gross amount at which carried at close of period, Total 50,188      
Accumulated Depreciation and Amortization 7,320      
Barracks Road        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 4,363      
Initial cost to company, Buildings and Improvements 16,459      
Cost Capitalized Subsequent to Acquisition 49,352      
Gross amount at which carried at close of period, Land 4,363      
Gross amount at which carried at close of period, Buildings and Improvements 65,811      
Gross amount at which carried at close of period, Total 70,174      
Accumulated Depreciation and Amortization 50,852      
Bell Gardens        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 11,861      
Initial cost to company, Land 24,406      
Initial cost to company, Buildings and Improvements 85,947      
Cost Capitalized Subsequent to Acquisition 1,929      
Gross amount at which carried at close of period, Land 24,406      
Gross amount at which carried at close of period, Buildings and Improvements 87,876      
Gross amount at which carried at close of period, Total 112,282      
Accumulated Depreciation and Amortization 18,619      
Bethesda Row        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 46,579      
Initial cost to company, Buildings and Improvements 35,406      
Cost Capitalized Subsequent to Acquisition 168,421      
Gross amount at which carried at close of period, Land 43,904      
Gross amount at which carried at close of period, Buildings and Improvements 206,502      
Gross amount at which carried at close of period, Total 250,406      
Accumulated Depreciation and Amortization 99,202      
Birch & Broad (formerly known as Falls Plaza)        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 1,798      
Initial cost to company, Buildings and Improvements 1,270      
Cost Capitalized Subsequent to Acquisition 20,876      
Gross amount at which carried at close of period, Land 1,819      
Gross amount at which carried at close of period, Buildings and Improvements 22,125      
Gross amount at which carried at close of period, Total 23,944      
Accumulated Depreciation and Amortization 9,741      
Brick Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 24,715      
Cost Capitalized Subsequent to Acquisition 79,632      
Gross amount at which carried at close of period, Land 4,094      
Gross amount at which carried at close of period, Buildings and Improvements 100,253      
Gross amount at which carried at close of period, Total 104,347      
Accumulated Depreciation and Amortization 60,075      
Bristol Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 3,856      
Initial cost to company, Buildings and Improvements 15,959      
Cost Capitalized Subsequent to Acquisition 15,398      
Gross amount at which carried at close of period, Land 3,856      
Gross amount at which carried at close of period, Buildings and Improvements 31,357      
Gross amount at which carried at close of period, Total 35,213      
Accumulated Depreciation and Amortization 20,652      
Brook 35        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 11,345      
Initial cost to company, Land 7,128      
Initial cost to company, Buildings and Improvements 38,355      
Cost Capitalized Subsequent to Acquisition 4,722      
Gross amount at which carried at close of period, Land 7,128      
Gross amount at which carried at close of period, Buildings and Improvements 43,077      
Gross amount at which carried at close of period, Total 50,205      
Accumulated Depreciation and Amortization 11,296      
Camelback Colonnade        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 52,658      
Initial cost to company, Buildings and Improvements 126,646      
Cost Capitalized Subsequent to Acquisition 49      
Gross amount at which carried at close of period, Land 52,658      
Gross amount at which carried at close of period, Buildings and Improvements 126,695      
Gross amount at which carried at close of period, Total 179,353      
Accumulated Depreciation and Amortization 2,655      
Campus Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 16,710      
Initial cost to company, Buildings and Improvements 13,412      
Cost Capitalized Subsequent to Acquisition 433      
Gross amount at which carried at close of period, Land 16,710      
Gross amount at which carried at close of period, Buildings and Improvements 13,845      
Gross amount at which carried at close of period, Total 30,555      
Accumulated Depreciation and Amortization 3,381      
Chelsea Commons        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 4,692      
Initial cost to company, Land 8,689      
Initial cost to company, Buildings and Improvements 19,466      
Cost Capitalized Subsequent to Acquisition 2,439      
Gross amount at which carried at close of period, Land 8,669      
Gross amount at which carried at close of period, Buildings and Improvements 21,925      
Gross amount at which carried at close of period, Total 30,594      
Accumulated Depreciation and Amortization 9,596      
Chesterbrook        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 13,042      
Initial cost to company, Buildings and Improvements 24,725      
Cost Capitalized Subsequent to Acquisition 509      
Gross amount at which carried at close of period, Land 13,042      
Gross amount at which carried at close of period, Buildings and Improvements 25,234      
Gross amount at which carried at close of period, Total 38,276      
Accumulated Depreciation and Amortization 594      
CocoWalk        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 32,513      
Initial cost to company, Buildings and Improvements 71,536      
Cost Capitalized Subsequent to Acquisition 87,188      
Gross amount at which carried at close of period, Land 48,944      
Gross amount at which carried at close of period, Buildings and Improvements 142,293      
Gross amount at which carried at close of period, Total 191,237      
Accumulated Depreciation and Amortization 16,485      
Colorado Blvd        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 2,415      
Initial cost to company, Buildings and Improvements 3,964      
Cost Capitalized Subsequent to Acquisition 7,109      
Gross amount at which carried at close of period, Land 2,415      
Gross amount at which carried at close of period, Buildings and Improvements 11,073      
Gross amount at which carried at close of period, Total 13,488      
Accumulated Depreciation and Amortization 9,715      
Congressional Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 2,793      
Initial cost to company, Buildings and Improvements 7,424      
Cost Capitalized Subsequent to Acquisition 97,556      
Gross amount at which carried at close of period, Land 2,793      
Gross amount at which carried at close of period, Buildings and Improvements 104,980      
Gross amount at which carried at close of period, Total 107,773      
Accumulated Depreciation and Amortization 63,539      
Courthouse Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 1,750      
Initial cost to company, Buildings and Improvements 1,869      
Cost Capitalized Subsequent to Acquisition 3,497      
Gross amount at which carried at close of period, Land 1,750      
Gross amount at which carried at close of period, Buildings and Improvements 5,366      
Gross amount at which carried at close of period, Total 7,116      
Accumulated Depreciation and Amortization 3,141      
Crossroads        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 4,635      
Initial cost to company, Buildings and Improvements 11,611      
Cost Capitalized Subsequent to Acquisition 19,769      
Gross amount at which carried at close of period, Land 4,635      
Gross amount at which carried at close of period, Buildings and Improvements 31,380      
Gross amount at which carried at close of period, Total 36,015      
Accumulated Depreciation and Amortization 21,669      
Crow Canyon Commons        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 27,245      
Initial cost to company, Buildings and Improvements 54,575      
Cost Capitalized Subsequent to Acquisition 8,854      
Gross amount at which carried at close of period, Land 27,245      
Gross amount at which carried at close of period, Buildings and Improvements 63,429      
Gross amount at which carried at close of period, Total 90,674      
Accumulated Depreciation and Amortization 30,337      
Darien Commons        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 30,368      
Initial cost to company, Buildings and Improvements 19,523      
Cost Capitalized Subsequent to Acquisition 48,601      
Gross amount at which carried at close of period, Land 30,368      
Gross amount at which carried at close of period, Buildings and Improvements 68,124      
Gross amount at which carried at close of period, Total 98,492      
Accumulated Depreciation and Amortization 3,561      
Dedham Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 16,658      
Initial cost to company, Buildings and Improvements 13,964      
Cost Capitalized Subsequent to Acquisition 17,152      
Gross amount at which carried at close of period, Land 16,658      
Gross amount at which carried at close of period, Buildings and Improvements 31,116      
Gross amount at which carried at close of period, Total 47,774      
Accumulated Depreciation and Amortization 19,358      
Del Mar Village        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 15,624      
Initial cost to company, Buildings and Improvements 41,712      
Cost Capitalized Subsequent to Acquisition 16,886      
Gross amount at which carried at close of period, Land 15,587      
Gross amount at which carried at close of period, Buildings and Improvements 58,635      
Gross amount at which carried at close of period, Total 74,222      
Accumulated Depreciation and Amortization 28,150      
East Bay Bridge        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 29,069      
Initial cost to company, Buildings and Improvements 138,035      
Cost Capitalized Subsequent to Acquisition 12,354      
Gross amount at which carried at close of period, Land 29,069      
Gross amount at which carried at close of period, Buildings and Improvements 150,389      
Gross amount at which carried at close of period, Total 179,458      
Accumulated Depreciation and Amortization 46,612      
Elllisburg        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 4,028      
Initial cost to company, Buildings and Improvements 11,309      
Cost Capitalized Subsequent to Acquisition 20,737      
Gross amount at which carried at close of period, Land 4,013      
Gross amount at which carried at close of period, Buildings and Improvements 32,061      
Gross amount at which carried at close of period, Total 36,074      
Accumulated Depreciation and Amortization 22,684      
Escondido Promenade        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 19,117      
Initial cost to company, Buildings and Improvements 15,829      
Cost Capitalized Subsequent to Acquisition 19,823      
Gross amount at which carried at close of period, Land 19,117      
Gross amount at which carried at close of period, Buildings and Improvements 35,652      
Gross amount at which carried at close of period, Total 54,769      
Accumulated Depreciation and Amortization 22,092      
Fairfax Junction        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 16,768      
Initial cost to company, Buildings and Improvements 23,825      
Cost Capitalized Subsequent to Acquisition 1,216      
Gross amount at which carried at close of period, Land 16,768      
Gross amount at which carried at close of period, Buildings and Improvements 25,041      
Gross amount at which carried at close of period, Total 41,809      
Accumulated Depreciation and Amortization 2,724      
Federal Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 10,216      
Initial cost to company, Buildings and Improvements 17,895      
Cost Capitalized Subsequent to Acquisition 43,788      
Gross amount at which carried at close of period, Land 10,216      
Gross amount at which carried at close of period, Buildings and Improvements 61,683      
Gross amount at which carried at close of period, Total 71,899      
Accumulated Depreciation and Amortization 50,473      
Finley Square        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 9,252      
Initial cost to company, Buildings and Improvements 9,544      
Cost Capitalized Subsequent to Acquisition 22,953      
Gross amount at which carried at close of period, Land 9,252      
Gross amount at which carried at close of period, Buildings and Improvements 32,497      
Gross amount at which carried at close of period, Total 41,749      
Accumulated Depreciation and Amortization 24,386      
Flourtown        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 1,345      
Initial cost to company, Buildings and Improvements 3,943      
Cost Capitalized Subsequent to Acquisition 11,910      
Gross amount at which carried at close of period, Land 1,507      
Gross amount at which carried at close of period, Buildings and Improvements 15,691      
Gross amount at which carried at close of period, Total 17,198      
Accumulated Depreciation and Amortization 7,851      
Fourth Street        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 13,978      
Initial cost to company, Buildings and Improvements 9,909      
Cost Capitalized Subsequent to Acquisition 3,345      
Gross amount at which carried at close of period, Land 13,978      
Gross amount at which carried at close of period, Buildings and Improvements 13,254      
Gross amount at which carried at close of period, Total 27,232      
Accumulated Depreciation and Amortization 2,627      
Freedom Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 3,255      
Cost Capitalized Subsequent to Acquisition 40,620      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 43,875      
Gross amount at which carried at close of period, Total 43,875      
Accumulated Depreciation and Amortization 1,820      
Fresh Meadows        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 24,625      
Initial cost to company, Buildings and Improvements 25,255      
Cost Capitalized Subsequent to Acquisition 44,201      
Gross amount at which carried at close of period, Land 24,633      
Gross amount at which carried at close of period, Buildings and Improvements 69,448      
Gross amount at which carried at close of period, Total 94,081      
Accumulated Depreciation and Amortization 48,793      
Friendship Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 12,696      
Initial cost to company, Buildings and Improvements 20,803      
Cost Capitalized Subsequent to Acquisition 2,966      
Gross amount at which carried at close of period, Land 12,696      
Gross amount at which carried at close of period, Buildings and Improvements 23,769      
Gross amount at which carried at close of period, Total 36,465      
Accumulated Depreciation and Amortization 14,158      
Gaithersburg Square        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 7,701      
Initial cost to company, Buildings and Improvements 5,271      
Cost Capitalized Subsequent to Acquisition 23,999      
Gross amount at which carried at close of period, Land 5,973      
Gross amount at which carried at close of period, Buildings and Improvements 30,998      
Gross amount at which carried at close of period, Total 36,971      
Accumulated Depreciation and Amortization 19,397      
Garden Market        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 2,677      
Initial cost to company, Buildings and Improvements 4,829      
Cost Capitalized Subsequent to Acquisition 7,305      
Gross amount at which carried at close of period, Land 2,677      
Gross amount at which carried at close of period, Buildings and Improvements 12,134      
Gross amount at which carried at close of period, Total 14,811      
Accumulated Depreciation and Amortization 9,636      
Georgetowne Shopping Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 32,202      
Initial cost to company, Buildings and Improvements 49,586      
Cost Capitalized Subsequent to Acquisition 2,728      
Gross amount at which carried at close of period, Land 32,202      
Gross amount at which carried at close of period, Buildings and Improvements 52,314      
Gross amount at which carried at close of period, Total 84,516      
Accumulated Depreciation and Amortization 3,841      
Governor Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 2,068      
Initial cost to company, Buildings and Improvements 4,905      
Cost Capitalized Subsequent to Acquisition 19,619      
Gross amount at which carried at close of period, Land 2,068      
Gross amount at which carried at close of period, Buildings and Improvements 24,524      
Gross amount at which carried at close of period, Total 26,592      
Accumulated Depreciation and Amortization 21,877      
Graham Park Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 642      
Initial cost to company, Buildings and Improvements 7,629      
Cost Capitalized Subsequent to Acquisition 15,155      
Gross amount at which carried at close of period, Land 653      
Gross amount at which carried at close of period, Buildings and Improvements 22,773      
Gross amount at which carried at close of period, Total 23,426      
Accumulated Depreciation and Amortization 18,267      
Gratiot Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 525      
Initial cost to company, Buildings and Improvements 1,601      
Cost Capitalized Subsequent to Acquisition 18,168      
Gross amount at which carried at close of period, Land 525      
Gross amount at which carried at close of period, Buildings and Improvements 19,769      
Gross amount at which carried at close of period, Total 20,294      
Accumulated Depreciation and Amortization 18,232      
Greenlawn Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 10,590      
Initial cost to company, Buildings and Improvements 20,869      
Cost Capitalized Subsequent to Acquisition 1,278      
Gross amount at which carried at close of period, Land 10,730      
Gross amount at which carried at close of period, Buildings and Improvements 22,007      
Gross amount at which carried at close of period, Total 32,737      
Accumulated Depreciation and Amortization 5,089      
Greenwich Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 7,484      
Initial cost to company, Buildings and Improvements 5,445      
Cost Capitalized Subsequent to Acquisition 10,819      
Gross amount at which carried at close of period, Land 7,484      
Gross amount at which carried at close of period, Buildings and Improvements 16,264      
Gross amount at which carried at close of period, Total 23,748      
Accumulated Depreciation and Amortization 6,120      
Grossmont Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 125,434      
Initial cost to company, Buildings and Improvements 50,311      
Cost Capitalized Subsequent to Acquisition 173      
Gross amount at which carried at close of period, Land 125,434      
Gross amount at which carried at close of period, Buildings and Improvements 50,484      
Gross amount at which carried at close of period, Total 175,918      
Accumulated Depreciation and Amortization 2,093      
Hastings Ranch Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 2,257      
Initial cost to company, Buildings and Improvements 22,393      
Cost Capitalized Subsequent to Acquisition 1,055      
Gross amount at which carried at close of period, Land 2,257      
Gross amount at which carried at close of period, Buildings and Improvements 23,448      
Gross amount at which carried at close of period, Total 25,705      
Accumulated Depreciation and Amortization 3,812      
Hauppauge        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 8,791      
Initial cost to company, Buildings and Improvements 15,262      
Cost Capitalized Subsequent to Acquisition 9,789      
Gross amount at which carried at close of period, Land 8,420      
Gross amount at which carried at close of period, Buildings and Improvements 25,422      
Gross amount at which carried at close of period, Total 33,842      
Accumulated Depreciation and Amortization 14,452      
Hilton Village        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 40,079      
Cost Capitalized Subsequent to Acquisition 28      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 40,107      
Gross amount at which carried at close of period, Total 40,107      
Accumulated Depreciation and Amortization 772      
Hoboken        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 104,704      
Initial cost to company, Land 47,460      
Initial cost to company, Buildings and Improvements 167,835      
Cost Capitalized Subsequent to Acquisition 1,075      
Gross amount at which carried at close of period, Land 47,462      
Gross amount at which carried at close of period, Buildings and Improvements 168,908      
Gross amount at which carried at close of period, Total 216,370      
Accumulated Depreciation and Amortization 11,389      
Hollywood Blvd.        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 8,300      
Initial cost to company, Buildings and Improvements 16,920      
Cost Capitalized Subsequent to Acquisition 36,635      
Gross amount at which carried at close of period, Land 8,370      
Gross amount at which carried at close of period, Buildings and Improvements 53,485      
Gross amount at which carried at close of period, Total 61,855      
Accumulated Depreciation and Amortization 20,813      
Huntington        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 12,194      
Initial cost to company, Buildings and Improvements 16,008      
Cost Capitalized Subsequent to Acquisition 23,585      
Gross amount at which carried at close of period, Land 12,294      
Gross amount at which carried at close of period, Buildings and Improvements 39,493      
Gross amount at which carried at close of period, Total 51,787      
Accumulated Depreciation and Amortization 17,564      
Huntington Square        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 10,075      
Cost Capitalized Subsequent to Acquisition 3,621      
Gross amount at which carried at close of period, Land 506      
Gross amount at which carried at close of period, Buildings and Improvements 13,190      
Gross amount at which carried at close of period, Total 13,696      
Accumulated Depreciation and Amortization 5,281      
Idylwood Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 4,308      
Initial cost to company, Buildings and Improvements 10,026      
Cost Capitalized Subsequent to Acquisition 3,212      
Gross amount at which carried at close of period, Land 4,308      
Gross amount at which carried at close of period, Buildings and Improvements 13,238      
Gross amount at which carried at close of period, Total 17,546      
Accumulated Depreciation and Amortization 10,526      
Kings Court        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 10,714      
Cost Capitalized Subsequent to Acquisition 896      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 11,610      
Gross amount at which carried at close of period, Total 11,610      
Accumulated Depreciation and Amortization 10,410      
Lancaster        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 2,103      
Cost Capitalized Subsequent to Acquisition 6,291      
Gross amount at which carried at close of period, Land 432      
Gross amount at which carried at close of period, Buildings and Improvements 7,962      
Gross amount at which carried at close of period, Total 8,394      
Accumulated Depreciation and Amortization 6,230      
Langhorne Square        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 720      
Initial cost to company, Buildings and Improvements 2,974      
Cost Capitalized Subsequent to Acquisition 20,100      
Gross amount at which carried at close of period, Land 720      
Gross amount at which carried at close of period, Buildings and Improvements 23,074      
Gross amount at which carried at close of period, Total 23,794      
Accumulated Depreciation and Amortization 17,855      
Laurel        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 7,458      
Initial cost to company, Buildings and Improvements 22,525      
Cost Capitalized Subsequent to Acquisition 30,379      
Gross amount at which carried at close of period, Land 7,503      
Gross amount at which carried at close of period, Buildings and Improvements 52,859      
Gross amount at which carried at close of period, Total 60,362      
Accumulated Depreciation and Amortization 42,998      
Lawrence Park        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 6,150      
Initial cost to company, Buildings and Improvements 8,491      
Cost Capitalized Subsequent to Acquisition 36,084      
Gross amount at which carried at close of period, Land 6,161      
Gross amount at which carried at close of period, Buildings and Improvements 44,564      
Gross amount at which carried at close of period, Total 50,725      
Accumulated Depreciation and Amortization 24,724      
Linden Square        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 79,382      
Initial cost to company, Buildings and Improvements 19,247      
Cost Capitalized Subsequent to Acquisition 52,762      
Gross amount at which carried at close of period, Land 79,346      
Gross amount at which carried at close of period, Buildings and Improvements 72,045      
Gross amount at which carried at close of period, Total 151,391      
Accumulated Depreciation and Amortization 31,683      
Melville Mall        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 35,622      
Initial cost to company, Buildings and Improvements 32,882      
Cost Capitalized Subsequent to Acquisition 36,295      
Gross amount at which carried at close of period, Land 35,622      
Gross amount at which carried at close of period, Buildings and Improvements 69,177      
Gross amount at which carried at close of period, Total 104,799      
Accumulated Depreciation and Amortization 22,365      
Mercer Mall        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 5,917      
Initial cost to company, Buildings and Improvements 18,358      
Cost Capitalized Subsequent to Acquisition 49,175      
Gross amount at which carried at close of period, Land 5,869      
Gross amount at which carried at close of period, Buildings and Improvements 67,581      
Gross amount at which carried at close of period, Total 73,450      
Accumulated Depreciation and Amortization 37,855      
Montrose Crossing        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 48,624      
Initial cost to company, Buildings and Improvements 91,819      
Cost Capitalized Subsequent to Acquisition 27,521      
Gross amount at which carried at close of period, Land 48,624      
Gross amount at which carried at close of period, Buildings and Improvements 119,340      
Gross amount at which carried at close of period, Total 167,964      
Accumulated Depreciation and Amortization 39,706      
Mount Vernon Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 15,769      
Initial cost to company, Buildings and Improvements 33,501      
Cost Capitalized Subsequent to Acquisition 43,993      
Gross amount at which carried at close of period, Land 15,851      
Gross amount at which carried at close of period, Buildings and Improvements 77,412      
Gross amount at which carried at close of period, Total 93,263      
Accumulated Depreciation and Amortization 44,668      
North Dartmouth        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 9,366      
Initial cost to company, Buildings and Improvements 0      
Cost Capitalized Subsequent to Acquisition 3      
Gross amount at which carried at close of period, Land 9,366      
Gross amount at which carried at close of period, Buildings and Improvements 3      
Gross amount at which carried at close of period, Total 9,369      
Accumulated Depreciation and Amortization 2      
Northeast        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 938      
Initial cost to company, Buildings and Improvements 8,779      
Cost Capitalized Subsequent to Acquisition 24,719      
Gross amount at which carried at close of period, Land 939      
Gross amount at which carried at close of period, Buildings and Improvements 33,497      
Gross amount at which carried at close of period, Total 34,436      
Accumulated Depreciation and Amortization 21,263      
Old Keene Mill        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 638      
Initial cost to company, Buildings and Improvements 998      
Cost Capitalized Subsequent to Acquisition 11,550      
Gross amount at which carried at close of period, Land 638      
Gross amount at which carried at close of period, Buildings and Improvements 12,548      
Gross amount at which carried at close of period, Total 13,186      
Accumulated Depreciation and Amortization 7,002      
Old Town Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 3,420      
Initial cost to company, Buildings and Improvements 2,765      
Cost Capitalized Subsequent to Acquisition 32,909      
Gross amount at which carried at close of period, Land 3,420      
Gross amount at which carried at close of period, Buildings and Improvements 35,674      
Gross amount at which carried at close of period, Total 39,094      
Accumulated Depreciation and Amortization 24,723      
Olivo at Mission Hills        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 15,048      
Initial cost to company, Buildings and Improvements 46,732      
Cost Capitalized Subsequent to Acquisition 20,441      
Gross amount at which carried at close of period, Land 15,048      
Gross amount at which carried at close of period, Buildings and Improvements 67,173      
Gross amount at which carried at close of period, Total 82,221      
Accumulated Depreciation and Amortization 6,614      
Pan Am Shopping Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 8,694      
Initial cost to company, Buildings and Improvements 12,929      
Cost Capitalized Subsequent to Acquisition 8,873      
Gross amount at which carried at close of period, Land 8,695      
Gross amount at which carried at close of period, Buildings and Improvements 21,801      
Gross amount at which carried at close of period, Total 30,496      
Accumulated Depreciation and Amortization 17,516      
Pentagon Row        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 2,955      
Cost Capitalized Subsequent to Acquisition 103,692      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 106,647      
Gross amount at which carried at close of period, Total 106,647      
Accumulated Depreciation and Amortization 56,156      
Perring Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 2,800      
Initial cost to company, Buildings and Improvements 6,461      
Cost Capitalized Subsequent to Acquisition 26,626      
Gross amount at which carried at close of period, Land 2,800      
Gross amount at which carried at close of period, Buildings and Improvements 33,087      
Gross amount at which carried at close of period, Total 35,887      
Accumulated Depreciation and Amortization 25,356      
Pike & Rose        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 31,471      
Initial cost to company, Buildings and Improvements 10,335      
Cost Capitalized Subsequent to Acquisition 682,962      
Gross amount at which carried at close of period, Land 33,716      
Gross amount at which carried at close of period, Buildings and Improvements 691,052      
Gross amount at which carried at close of period, Total 724,768      
Accumulated Depreciation and Amortization 83,746      
Pike 7        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 14,970      
Initial cost to company, Buildings and Improvements 22,799      
Cost Capitalized Subsequent to Acquisition 13,142      
Gross amount at which carried at close of period, Land 14,914      
Gross amount at which carried at close of period, Buildings and Improvements 35,997      
Gross amount at which carried at close of period, Total 50,911      
Accumulated Depreciation and Amortization 20,740      
Plaza Del Mercado        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 10,305      
Initial cost to company, Buildings and Improvements 21,553      
Cost Capitalized Subsequent to Acquisition 15,114      
Gross amount at which carried at close of period, Land 10,305      
Gross amount at which carried at close of period, Buildings and Improvements 36,667      
Gross amount at which carried at close of period, Total 46,972      
Accumulated Depreciation and Amortization 8,763      
Plaza Del Sol        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 5,605      
Initial cost to company, Buildings and Improvements 12,331      
Cost Capitalized Subsequent to Acquisition (55)      
Gross amount at which carried at close of period, Land 5,605      
Gross amount at which carried at close of period, Buildings and Improvements 12,276      
Gross amount at which carried at close of period, Total 17,881      
Accumulated Depreciation and Amortization 1,882      
Plaza El Segundo/The Point        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 124,521      
Initial cost to company, Land 62,127      
Initial cost to company, Buildings and Improvements 153,556      
Cost Capitalized Subsequent to Acquisition 84,287      
Gross amount at which carried at close of period, Land 64,788      
Gross amount at which carried at close of period, Buildings and Improvements 235,182      
Gross amount at which carried at close of period, Total 299,970      
Accumulated Depreciation and Amortization 68,627      
Queen Anne Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 3,319      
Initial cost to company, Buildings and Improvements 8,457      
Cost Capitalized Subsequent to Acquisition 6,827      
Gross amount at which carried at close of period, Land 3,319      
Gross amount at which carried at close of period, Buildings and Improvements 15,284      
Gross amount at which carried at close of period, Total 18,603      
Accumulated Depreciation and Amortization 11,427      
Quince Orchard        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 3,197      
Initial cost to company, Buildings and Improvements 7,949      
Cost Capitalized Subsequent to Acquisition 29,995      
Gross amount at which carried at close of period, Land 2,928      
Gross amount at which carried at close of period, Buildings and Improvements 38,213      
Gross amount at which carried at close of period, Total 41,141      
Accumulated Depreciation and Amortization 25,984      
Riverpoint Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 15,422      
Initial cost to company, Buildings and Improvements 104,572      
Cost Capitalized Subsequent to Acquisition 1,609      
Gross amount at which carried at close of period, Land 15,422      
Gross amount at which carried at close of period, Buildings and Improvements 106,181      
Gross amount at which carried at close of period, Total 121,603      
Accumulated Depreciation and Amortization 16,197      
Rockville Town Square        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 8,092      
Cost Capitalized Subsequent to Acquisition 36,927      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 45,019      
Gross amount at which carried at close of period, Total 45,019      
Accumulated Depreciation and Amortization 20,165      
Rollingwood Apts.        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 552      
Initial cost to company, Buildings and Improvements 2,246      
Cost Capitalized Subsequent to Acquisition 10,695      
Gross amount at which carried at close of period, Land 774      
Gross amount at which carried at close of period, Buildings and Improvements 12,719      
Gross amount at which carried at close of period, Total 13,493      
Accumulated Depreciation and Amortization 10,529      
San Antonio Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 26,400      
Initial cost to company, Buildings and Improvements 18,462      
Cost Capitalized Subsequent to Acquisition 3,268      
Gross amount at which carried at close of period, Land 26,400      
Gross amount at which carried at close of period, Buildings and Improvements 21,730      
Gross amount at which carried at close of period, Total 48,130      
Accumulated Depreciation and Amortization 5,408      
Santana Row        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 66,682      
Initial cost to company, Buildings and Improvements 7,502      
Cost Capitalized Subsequent to Acquisition 1,172,412      
Gross amount at which carried at close of period, Land 57,592      
Gross amount at which carried at close of period, Buildings and Improvements 1,189,004      
Gross amount at which carried at close of period, Total 1,246,596      
Accumulated Depreciation and Amortization 268,804      
Sylmar Towne Center        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 18,522      
Initial cost to company, Buildings and Improvements 24,637      
Cost Capitalized Subsequent to Acquisition 2,964      
Gross amount at which carried at close of period, Land 18,522      
Gross amount at which carried at close of period, Buildings and Improvements 27,601      
Gross amount at which carried at close of period, Total 46,123      
Accumulated Depreciation and Amortization 3,936      
THE AVENUE at White Marsh        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 20,682      
Initial cost to company, Buildings and Improvements 72,432      
Cost Capitalized Subsequent to Acquisition 30,635      
Gross amount at which carried at close of period, Land 20,685      
Gross amount at which carried at close of period, Buildings and Improvements 103,064      
Gross amount at which carried at close of period, Total 123,749      
Accumulated Depreciation and Amortization 45,759      
The Grove at Shrewsbury        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 43,070      
Initial cost to company, Land 18,016      
Initial cost to company, Buildings and Improvements 103,115      
Cost Capitalized Subsequent to Acquisition 7,759      
Gross amount at which carried at close of period, Land 18,021      
Gross amount at which carried at close of period, Buildings and Improvements 110,869      
Gross amount at which carried at close of period, Total 128,890      
Accumulated Depreciation and Amortization 28,225      
The Shoppes At Nottingham Square        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 4,441      
Initial cost to company, Buildings and Improvements 12,849      
Cost Capitalized Subsequent to Acquisition 1,446      
Gross amount at which carried at close of period, Land 4,441      
Gross amount at which carried at close of period, Buildings and Improvements 14,295      
Gross amount at which carried at close of period, Total 18,736      
Accumulated Depreciation and Amortization 6,961      
Third Street Promenade        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 22,645      
Initial cost to company, Buildings and Improvements 12,709      
Cost Capitalized Subsequent to Acquisition 52,419      
Gross amount at which carried at close of period, Land 25,125      
Gross amount at which carried at close of period, Buildings and Improvements 62,648      
Gross amount at which carried at close of period, Total 87,773      
Accumulated Depreciation and Amortization 36,265      
Tower Shopping Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 7,170      
Initial cost to company, Buildings and Improvements 10,518      
Cost Capitalized Subsequent to Acquisition 5,210      
Gross amount at which carried at close of period, Land 7,280      
Gross amount at which carried at close of period, Buildings and Improvements 15,618      
Gross amount at which carried at close of period, Total 22,898      
Accumulated Depreciation and Amortization 11,009      
Tower Shops        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 29,940      
Initial cost to company, Buildings and Improvements 43,390      
Cost Capitalized Subsequent to Acquisition 27,794      
Gross amount at which carried at close of period, Land 29,962      
Gross amount at which carried at close of period, Buildings and Improvements 71,162      
Gross amount at which carried at close of period, Total 101,124      
Accumulated Depreciation and Amortization 26,237      
Town Center of New Britain        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 1,282      
Initial cost to company, Buildings and Improvements 12,285      
Cost Capitalized Subsequent to Acquisition 3,358      
Gross amount at which carried at close of period, Land 1,693      
Gross amount at which carried at close of period, Buildings and Improvements 15,232      
Gross amount at which carried at close of period, Total 16,925      
Accumulated Depreciation and Amortization 7,047      
Townson Residential        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 2,328      
Initial cost to company, Buildings and Improvements 0      
Cost Capitalized Subsequent to Acquisition 20,092      
Gross amount at which carried at close of period, Land 2,328      
Gross amount at which carried at close of period, Buildings and Improvements 20,092      
Gross amount at which carried at close of period, Total 22,420      
Accumulated Depreciation and Amortization 2,703      
Troy        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 3,126      
Initial cost to company, Buildings and Improvements 5,193      
Cost Capitalized Subsequent to Acquisition 32,847      
Gross amount at which carried at close of period, Land 5,865      
Gross amount at which carried at close of period, Buildings and Improvements 35,301      
Gross amount at which carried at close of period, Total 41,166      
Accumulated Depreciation and Amortization 25,111      
Twinbrooke Shopping Centre        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 16,484      
Initial cost to company, Buildings and Improvements 18,898      
Cost Capitalized Subsequent to Acquisition 57      
Gross amount at which carried at close of period, Land 16,484      
Gross amount at which carried at close of period, Buildings and Improvements 18,955      
Gross amount at which carried at close of period, Total 35,439      
Accumulated Depreciation and Amortization 263      
Tyson's Station        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 388      
Initial cost to company, Buildings and Improvements 453      
Cost Capitalized Subsequent to Acquisition 5,241      
Gross amount at which carried at close of period, Land 493      
Gross amount at which carried at close of period, Buildings and Improvements 5,589      
Gross amount at which carried at close of period, Total 6,082      
Accumulated Depreciation and Amortization 4,238      
Village at Shirlington        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 9,761      
Initial cost to company, Buildings and Improvements 14,808      
Cost Capitalized Subsequent to Acquisition 39,526      
Gross amount at which carried at close of period, Land 4,234      
Gross amount at which carried at close of period, Buildings and Improvements 59,861      
Gross amount at which carried at close of period, Total 64,095      
Accumulated Depreciation and Amortization 33,277      
Westgate Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 6,319      
Initial cost to company, Buildings and Improvements 107,284      
Cost Capitalized Subsequent to Acquisition 44,549      
Gross amount at which carried at close of period, Land 6,319      
Gross amount at which carried at close of period, Buildings and Improvements 151,833      
Gross amount at which carried at close of period, Total 158,152      
Accumulated Depreciation and Amortization 72,593      
White Marsh Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 3,478      
Initial cost to company, Buildings and Improvements 21,413      
Cost Capitalized Subsequent to Acquisition 1,674      
Gross amount at which carried at close of period, Land 3,514      
Gross amount at which carried at close of period, Buildings and Improvements 23,051      
Gross amount at which carried at close of period, Total 26,565      
Accumulated Depreciation and Amortization 11,094      
White Marsh Other        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 28,809      
Initial cost to company, Buildings and Improvements 0      
Cost Capitalized Subsequent to Acquisition 77      
Gross amount at which carried at close of period, Land 28,839      
Gross amount at which carried at close of period, Buildings and Improvements 47      
Gross amount at which carried at close of period, Total 28,886      
Accumulated Depreciation and Amortization 0      
Wildwood        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 9,111      
Initial cost to company, Buildings and Improvements 1,061      
Cost Capitalized Subsequent to Acquisition 17,219      
Gross amount at which carried at close of period, Land 9,111      
Gross amount at which carried at close of period, Buildings and Improvements 18,280      
Gross amount at which carried at close of period, Total 27,391      
Accumulated Depreciation and Amortization 10,298      
Willow Grove        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 1,499      
Initial cost to company, Buildings and Improvements 6,643      
Cost Capitalized Subsequent to Acquisition 23,943      
Gross amount at which carried at close of period, Land 1,499      
Gross amount at which carried at close of period, Buildings and Improvements 30,586      
Gross amount at which carried at close of period, Total 32,085      
Accumulated Depreciation and Amortization 22,653      
Willow Lawn        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 3,192      
Initial cost to company, Buildings and Improvements 7,723      
Cost Capitalized Subsequent to Acquisition 94,318      
Gross amount at which carried at close of period, Land 7,790      
Gross amount at which carried at close of period, Buildings and Improvements 97,443      
Gross amount at which carried at close of period, Total 105,233      
Accumulated Depreciation and Amortization 67,685      
Wynnewood        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 8,055      
Initial cost to company, Buildings and Improvements 13,759      
Cost Capitalized Subsequent to Acquisition 21,055      
Gross amount at which carried at close of period, Land 8,055      
Gross amount at which carried at close of period, Buildings and Improvements 34,814      
Gross amount at which carried at close of period, Total 42,869      
Accumulated Depreciation and Amortization $ 27,285      
[1] For Federal tax purposes, the aggregate cost basis is approximately $8.4 billion as of December 31, 2021.