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Schedule III - Summary of Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 563,061 $ 542,707    
Initial cost to company, Land 1,459,351      
Initial cost to company, Buildings and Improvements 2,425,230      
Cost Capitalized Subsequent to Acquisition 3,750,480      
Gross amount at which carried at close of period, Land 1,427,777      
Gross amount at which carried at close of period, Buildings and Improvements 6,207,284      
Gross amount at which carried at close of period, Total 7,635,061 6,759,073 $ 6,064,406 $ 5,608,998
Accumulated Depreciation and Amortization 1,876,544 $ 1,729,234 $ 1,574,041 $ 1,467,050
29th Place        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 4,312      
Initial cost to company, Land 10,211      
Initial cost to company, Buildings and Improvements 18,863      
Cost Capitalized Subsequent to Acquisition 11,973      
Gross amount at which carried at close of period, Land 10,195      
Gross amount at which carried at close of period, Buildings and Improvements 30,852      
Gross amount at which carried at close of period, Total 41,047      
Accumulated Depreciation and Amortization $ 12,144      
Life on which depreciation in latest income statements is computed 35 years      
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 11,161      
Gross amount at which carried at close of period, Land 2,432      
Gross amount at which carried at close of period, Buildings and Improvements 23,507      
Gross amount at which carried at close of period, Total 25,939      
Accumulated Depreciation and Amortization $ 19,028      
Life on which depreciation in latest income statements is computed 35 years      
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 564,077      
Gross amount at which carried at close of period, Land 69,421      
Gross amount at which carried at close of period, Buildings and Improvements 622,104      
Gross amount at which carried at close of period, Total 691,525      
Accumulated Depreciation and Amortization $ 43,659      
Life on which depreciation in latest income statements is computed 35 years      
Atlantic Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 6,293      
Initial cost to company, Buildings and Improvements 17,109      
Cost Capitalized Subsequent to Acquisition 2,325      
Gross amount at which carried at close of period, Land 6,293      
Gross amount at which carried at close of period, Buildings and Improvements 19,434      
Gross amount at which carried at close of period, Total 25,727      
Accumulated Depreciation and Amortization $ 1,863      
Life on which depreciation in latest income statements is computed 35 years      
Azalea        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 39,609      
Initial cost to company, Land 40,219      
Initial cost to company, Buildings and Improvements 67,117      
Cost Capitalized Subsequent to Acquisition 4      
Gross amount at which carried at close of period, Land 40,219      
Gross amount at which carried at close of period, Buildings and Improvements 67,121      
Gross amount at which carried at close of period, Total 107,340      
Accumulated Depreciation and Amortization $ 1,049      
Life on which depreciation in latest income statements is computed 35 years      
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 23,443      
Gross amount at which carried at close of period, Land 2,581      
Gross amount at which carried at close of period, Buildings and Improvements 38,893      
Gross amount at which carried at close of period, Total 41,474      
Accumulated Depreciation and Amortization $ 20,299      
Life on which depreciation in latest income statements is computed 35 years      
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 3,279      
Gross amount at which carried at close of period, Land 12,617      
Gross amount at which carried at close of period, Buildings and Improvements 32,882      
Gross amount at which carried at close of period, Total 45,499      
Accumulated Depreciation and Amortization $ 2,030      
Life on which depreciation in latest income statements is computed 35 years      
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 47,088      
Gross amount at which carried at close of period, Land 4,363      
Gross amount at which carried at close of period, Buildings and Improvements 63,547      
Gross amount at which carried at close of period, Total 67,910      
Accumulated Depreciation and Amortization $ 42,077      
Life on which depreciation in latest income statements is computed 35 years      
Bell Gardens        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 12,682      
Initial cost to company, Land 18,021      
Initial cost to company, Buildings and Improvements 82,470      
Cost Capitalized Subsequent to Acquisition 159      
Gross amount at which carried at close of period, Land 18,021      
Gross amount at which carried at close of period, Buildings and Improvements 82,629      
Gross amount at which carried at close of period, Total 100,650      
Accumulated Depreciation and Amortization $ 1,843      
Life on which depreciation in latest income statements is computed 35 years      
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 144,089      
Gross amount at which carried at close of period, Land 43,896      
Gross amount at which carried at close of period, Buildings and Improvements 182,178      
Gross amount at which carried at close of period, Total 226,074      
Accumulated Depreciation and Amortization $ 73,883      
Bethesda Row | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statements is computed 35 years      
Bethesda Row | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statements is computed 50 years      
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 51,757      
Gross amount at which carried at close of period, Land 3,945      
Gross amount at which carried at close of period, Buildings and Improvements 72,527      
Gross amount at which carried at close of period, Total 76,472      
Accumulated Depreciation and Amortization $ 47,932      
Life on which depreciation in latest income statements is computed 35 years      
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 11,849      
Gross amount at which carried at close of period, Land 3,856      
Gross amount at which carried at close of period, Buildings and Improvements 27,808      
Gross amount at which carried at close of period, Total 31,664      
Accumulated Depreciation and Amortization $ 17,680      
Life on which depreciation in latest income statements is computed 35 years      
Brook 35        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 11,263      
Initial cost to company, Land 7,128      
Initial cost to company, Buildings and Improvements 38,355      
Cost Capitalized Subsequent to Acquisition 2,043      
Gross amount at which carried at close of period, Land 7,128      
Gross amount at which carried at close of period, Buildings and Improvements 40,398      
Gross amount at which carried at close of period, Total 47,526      
Accumulated Depreciation and Amortization $ 5,494      
Life on which depreciation in latest income statements is computed 35 years      
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 429      
Gross amount at which carried at close of period, Land 16,710      
Gross amount at which carried at close of period, Buildings and Improvements 13,841      
Gross amount at which carried at close of period, Total 30,551      
Accumulated Depreciation and Amortization $ 1,243      
Life on which depreciation in latest income statements is computed 35 years      
Chelsea Commons        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 6,037      
Initial cost to company, Land 9,417      
Initial cost to company, Buildings and Improvements 19,466      
Cost Capitalized Subsequent to Acquisition 14,015      
Gross amount at which carried at close of period, Land 9,396      
Gross amount at which carried at close of period, Buildings and Improvements 33,502      
Gross amount at which carried at close of period, Total 42,898      
Accumulated Depreciation and Amortization $ 8,509      
Life on which depreciation in latest income statements is computed 35 years      
CocoWalk        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 35,063      
Initial cost to company, Buildings and Improvements 71,476      
Cost Capitalized Subsequent to Acquisition 9,881      
Gross amount at which carried at close of period, Land 34,406      
Gross amount at which carried at close of period, Buildings and Improvements 82,014      
Gross amount at which carried at close of period, Total 116,420      
Accumulated Depreciation and Amortization $ 6,536      
Life on which depreciation in latest income statements is computed 35 years      
Colorado Blvd        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 5,262      
Initial cost to company, Buildings and Improvements 4,071      
Cost Capitalized Subsequent to Acquisition 10,184      
Gross amount at which carried at close of period, Land 5,262      
Gross amount at which carried at close of period, Buildings and Improvements 14,255      
Gross amount at which carried at close of period, Total 19,517      
Accumulated Depreciation and Amortization $ 10,678      
Life on which depreciation in latest income statements is computed 35 years      
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 92,104      
Gross amount at which carried at close of period, Land 1,020      
Gross amount at which carried at close of period, Buildings and Improvements 101,301      
Gross amount at which carried at close of period, Total 102,321      
Accumulated Depreciation and Amortization $ 53,731      
Life on which depreciation in latest income statements is computed 35 years      
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 1,532      
Gross amount at which carried at close of period, Land 1,750      
Gross amount at which carried at close of period, Buildings and Improvements 3,401      
Gross amount at which carried at close of period, Total 5,151      
Accumulated Depreciation and Amortization $ 1,923      
Life on which depreciation in latest income statements is computed 35 years      
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 16,882      
Gross amount at which carried at close of period, Land 4,635      
Gross amount at which carried at close of period, Buildings and Improvements 28,493      
Gross amount at which carried at close of period, Total 33,128      
Accumulated Depreciation and Amortization $ 16,494      
Life on which depreciation in latest income statements is computed 35 years      
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 8,525      
Gross amount at which carried at close of period, Land 27,245      
Gross amount at which carried at close of period, Buildings and Improvements 63,100      
Gross amount at which carried at close of period, Total 90,345      
Accumulated Depreciation and Amortization $ 21,704      
Life on which depreciation in latest income statements is computed 35 years      
Darien        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 29,809      
Initial cost to company, Buildings and Improvements 18,302      
Cost Capitalized Subsequent to Acquisition 1,862      
Gross amount at which carried at close of period, Land 29,809      
Gross amount at which carried at close of period, Buildings and Improvements 20,164      
Gross amount at which carried at close of period, Total 49,973      
Accumulated Depreciation and Amortization $ 3,075      
Life on which depreciation in latest income statements is computed 35 years      
Dedham Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 14,841      
Initial cost to company, Buildings and Improvements 12,918      
Cost Capitalized Subsequent to Acquisition 13,317      
Gross amount at which carried at close of period, Land 14,841      
Gross amount at which carried at close of period, Buildings and Improvements 26,235      
Gross amount at which carried at close of period, Total 41,076      
Accumulated Depreciation and Amortization $ 15,380      
Life on which depreciation in latest income statements is computed 35 years      
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 8,057      
Gross amount at which carried at close of period, Land 15,587      
Gross amount at which carried at close of period, Buildings and Improvements 49,806      
Gross amount at which carried at close of period, Total 65,393      
Accumulated Depreciation and Amortization $ 20,432      
Life on which depreciation in latest income statements is computed 35 years      
East Bay Bridge        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 29,079      
Initial cost to company, Buildings and Improvements 138,035      
Cost Capitalized Subsequent to Acquisition 11,772      
Gross amount at which carried at close of period, Land 29,079      
Gross amount at which carried at close of period, Buildings and Improvements 149,807      
Gross amount at which carried at close of period, Total 178,886      
Accumulated Depreciation and Amortization $ 25,229      
Life on which depreciation in latest income statements is computed 35 years      
Eastgate Crossing        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 1,608      
Initial cost to company, Buildings and Improvements 5,775      
Cost Capitalized Subsequent to Acquisition 26,981      
Gross amount at which carried at close of period, Land 1,608      
Gross amount at which carried at close of period, Buildings and Improvements 32,756      
Gross amount at which carried at close of period, Total 34,364      
Accumulated Depreciation and Amortization $ 19,622      
Life on which depreciation in latest income statements is computed 35 years      
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 19,211      
Gross amount at which carried at close of period, Land 4,013      
Gross amount at which carried at close of period, Buildings and Improvements 30,535      
Gross amount at which carried at close of period, Total 34,548      
Accumulated Depreciation and Amortization $ 20,099      
Life on which depreciation in latest income statements is computed 35 years      
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 14,530      
Gross amount at which carried at close of period, Land 19,117      
Gross amount at which carried at close of period, Buildings and Improvements 30,359      
Gross amount at which carried at close of period, Total 49,476      
Accumulated Depreciation and Amortization $ 16,037      
Life on which depreciation in latest income statements is computed 35 years      
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 10,943      
Gross amount at which carried at close of period, Land 1,819      
Gross amount at which carried at close of period, Buildings and Improvements 12,192      
Gross amount at which carried at close of period, Total 14,011      
Accumulated Depreciation and Amortization $ 8,664      
Life on which depreciation in latest income statements is computed 25 years      
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 41,769      
Gross amount at which carried at close of period, Land 10,216      
Gross amount at which carried at close of period, Buildings and Improvements 59,664      
Gross amount at which carried at close of period, Total 69,880      
Accumulated Depreciation and Amortization $ 42,794      
Life on which depreciation in latest income statements is computed 35 years      
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 19,604      
Gross amount at which carried at close of period, Land 9,252      
Gross amount at which carried at close of period, Buildings and Improvements 29,148      
Gross amount at which carried at close of period, Total 38,400      
Accumulated Depreciation and Amortization $ 19,836      
Life on which depreciation in latest income statements is computed 35 years      
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 11,666      
Gross amount at which carried at close of period, Land 1,345      
Gross amount at which carried at close of period, Buildings and Improvements 15,609      
Gross amount at which carried at close of period, Total 16,954      
Accumulated Depreciation and Amortization $ 5,981      
Life on which depreciation in latest income statements is computed 35 years      
Fourth Street        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 13,928      
Initial cost to company, Buildings and Improvements 9,909      
Cost Capitalized Subsequent to Acquisition 39      
Gross amount at which carried at close of period, Land 13,928      
Gross amount at which carried at close of period, Buildings and Improvements 9,948      
Gross amount at which carried at close of period, Total 23,876      
Accumulated Depreciation and Amortization $ 248      
Life on which depreciation in latest income statements is computed 35 years      
Free State Shopping Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 18,581      
Initial cost to company, Buildings and Improvements 41,658      
Cost Capitalized Subsequent to Acquisition 4,538      
Gross amount at which carried at close of period, Land 18,581      
Gross amount at which carried at close of period, Buildings and Improvements 46,196      
Gross amount at which carried at close of period, Total 64,777      
Accumulated Depreciation and Amortization $ 3,741      
Life on which depreciation in latest income statements is computed 35 years      
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 40,395      
Gross amount at which carried at close of period, Land 24,633      
Gross amount at which carried at close of period, Buildings and Improvements 65,642      
Gross amount at which carried at close of period, Total 90,275      
Accumulated Depreciation and Amortization $ 37,948      
Life on which depreciation in latest income statements is computed 35 years      
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 4,616      
Gross amount at which carried at close of period, Land 12,696      
Gross amount at which carried at close of period, Buildings and Improvements 25,419      
Gross amount at which carried at close of period, Total 38,115      
Accumulated Depreciation and Amortization $ 11,917      
Life on which depreciation in latest income statements is computed 35 years      
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 14,468      
Gross amount at which carried at close of period, Land 5,973      
Gross amount at which carried at close of period, Buildings and Improvements 21,467      
Gross amount at which carried at close of period, Total 27,440      
Accumulated Depreciation and Amortization $ 17,830      
Life on which depreciation in latest income statements is computed 35 years      
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 6,909      
Gross amount at which carried at close of period, Land 2,677      
Gross amount at which carried at close of period, Buildings and Improvements 11,738      
Gross amount at which carried at close of period, Total 14,415      
Accumulated Depreciation and Amortization $ 7,569      
Life on which depreciation in latest income statements is computed 35 years      
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 20,319      
Gross amount at which carried at close of period, Land 2,068      
Gross amount at which carried at close of period, Buildings and Improvements 25,224      
Gross amount at which carried at close of period, Total 27,292      
Accumulated Depreciation and Amortization $ 20,241      
Life on which depreciation in latest income statements is computed 35 years      
Graham Park Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 1,237      
Initial cost to company, Buildings and Improvements 15,096      
Cost Capitalized Subsequent to Acquisition 18,874      
Gross amount at which carried at close of period, Land 1,169      
Gross amount at which carried at close of period, Buildings and Improvements 34,038      
Gross amount at which carried at close of period, Total 35,207      
Accumulated Depreciation and Amortization $ 28,053      
Life on which depreciation in latest income statements is computed 35 years      
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 17,702      
Gross amount at which carried at close of period, Land 525      
Gross amount at which carried at close of period, Buildings and Improvements 19,303      
Gross amount at which carried at close of period, Total 19,828      
Accumulated Depreciation and Amortization $ 17,270      
Life on which depreciation in latest income statements is computed 25 years 9 months      
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 245      
Gross amount at which carried at close of period, Land 10,590      
Gross amount at which carried at close of period, Buildings and Improvements 21,114      
Gross amount at which carried at close of period, Total 31,704      
Accumulated Depreciation and Amortization $ 1,756      
Life on which depreciation in latest income statements is computed 35 years      
Greenwich Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 7,484      
Initial cost to company, Buildings and Improvements 5,444      
Cost Capitalized Subsequent to Acquisition 1,199      
Gross amount at which carried at close of period, Land 7,484      
Gross amount at which carried at close of period, Buildings and Improvements 6,643      
Gross amount at which carried at close of period, Total 14,127      
Accumulated Depreciation and Amortization $ 4,170      
Life on which depreciation in latest income statements is computed 35 years      
Hastings Ranch Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 0      
Initial cost to company, Buildings and Improvements 22,393      
Cost Capitalized Subsequent to Acquisition 236      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 22,629      
Gross amount at which carried at close of period, Total 22,629      
Accumulated Depreciation and Amortization $ 699      
Life on which depreciation in latest income statements is computed 35 years      
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 5,018      
Gross amount at which carried at close of period, Land 8,419      
Gross amount at which carried at close of period, Buildings and Improvements 20,652      
Gross amount at which carried at close of period, Total 29,071      
Accumulated Depreciation and Amortization $ 11,724      
Life on which depreciation in latest income statements is computed 35 years      
Hermosa Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 1,116      
Initial cost to company, Buildings and Improvements 280      
Cost Capitalized Subsequent to Acquisition 4,648      
Gross amount at which carried at close of period, Land 1,368      
Gross amount at which carried at close of period, Buildings and Improvements 4,676      
Gross amount at which carried at close of period, Total 6,044      
Accumulated Depreciation and Amortization $ 3,298      
Life on which depreciation in latest income statements is computed 35 years      
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 21,719      
Gross amount at which carried at close of period, Land 8,370      
Gross amount at which carried at close of period, Buildings and Improvements 38,569      
Gross amount at which carried at close of period, Total 46,939      
Accumulated Depreciation and Amortization $ 14,755      
Life on which depreciation in latest income statements is computed 35 years      
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 19,144      
Gross amount at which carried at close of period, Land 12,194      
Gross amount at which carried at close of period, Buildings and Improvements 35,152      
Gross amount at which carried at close of period, Total 47,346      
Accumulated Depreciation and Amortization $ 15,825      
Life on which depreciation in latest income statements is computed 35 years      
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 2,106      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 12,181      
Gross amount at which carried at close of period, Total 12,181      
Accumulated Depreciation and Amortization $ 3,317      
Life on which depreciation in latest income statements is computed 35 years      
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 2,579      
Gross amount at which carried at close of period, Land 4,308      
Gross amount at which carried at close of period, Buildings and Improvements 12,605      
Gross amount at which carried at close of period, Total 16,913      
Accumulated Depreciation and Amortization $ 8,928      
Life on which depreciation in latest income statements is computed 35 years      
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 954      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 11,668      
Gross amount at which carried at close of period, Total 11,668      
Accumulated Depreciation and Amortization $ 8,776      
Life on which depreciation in latest income statements is computed 26 years      
Lancaster        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 4,907      
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 2,103      
Cost Capitalized Subsequent to Acquisition 12,010      
Gross amount at which carried at close of period, Land 75      
Gross amount at which carried at close of period, Buildings and Improvements 14,038      
Gross amount at which carried at close of period, Total 14,113      
Accumulated Depreciation and Amortization $ 8,212      
Life on which depreciation in latest income statements is computed 22 years      
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 18,432      
Gross amount at which carried at close of period, Land 720      
Gross amount at which carried at close of period, Buildings and Improvements 21,406      
Gross amount at which carried at close of period, Total 22,126      
Accumulated Depreciation and Amortization $ 15,170      
Life on which depreciation in latest income statements is computed 35 years      
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 27,344      
Gross amount at which carried at close of period, Land 7,464      
Gross amount at which carried at close of period, Buildings and Improvements 49,863      
Gross amount at which carried at close of period, Total 57,327      
Accumulated Depreciation and Amortization $ 37,461      
Life on which depreciation in latest income statements is computed 35 years      
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 20,524      
Gross amount at which carried at close of period, Land 6,161      
Gross amount at which carried at close of period, Buildings and Improvements 29,004      
Gross amount at which carried at close of period, Total 35,165      
Accumulated Depreciation and Amortization $ 24,693      
Life on which depreciation in latest income statements is computed 22 years      
Leesburg Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 8,184      
Initial cost to company, Buildings and Improvements 10,722      
Cost Capitalized Subsequent to Acquisition 17,582      
Gross amount at which carried at close of period, Land 8,184      
Gross amount at which carried at close of period, Buildings and Improvements 28,304      
Gross amount at which carried at close of period, Total 36,488      
Accumulated Depreciation and Amortization $ 14,689      
Life on which depreciation in latest income statements is computed 35 years      
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 50,074      
Gross amount at which carried at close of period, Land 79,347      
Gross amount at which carried at close of period, Buildings and Improvements 69,356      
Gross amount at which carried at close of period, Total 148,703      
Accumulated Depreciation and Amortization $ 22,208      
Life on which depreciation in latest income statements is computed 35 years      
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 20,096      
Gross amount at which carried at close of period, Land 35,622      
Gross amount at which carried at close of period, Buildings and Improvements 52,978      
Gross amount at which carried at close of period, Total 88,600      
Accumulated Depreciation and Amortization $ 12,458      
Life on which depreciation in latest income statements is computed 35 years      
Mercer Mall        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 55,548      
Initial cost to company, Land 29,738      
Initial cost to company, Buildings and Improvements 51,047      
Cost Capitalized Subsequent to Acquisition 45,957      
Gross amount at which carried at close of period, Land 29,738      
Gross amount at which carried at close of period, Buildings and Improvements 97,004      
Gross amount at which carried at close of period, Total 126,742      
Accumulated Depreciation and Amortization $ 41,330      
Mercer Mall | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statements is computed 25 years      
Mercer Mall | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statements is computed 35 years      
Montrose Crossing        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 71,054      
Initial cost to company, Land 48,624      
Initial cost to company, Buildings and Improvements 91,819      
Cost Capitalized Subsequent to Acquisition 19,678      
Gross amount at which carried at close of period, Land 48,624      
Gross amount at which carried at close of period, Buildings and Improvements 111,497      
Gross amount at which carried at close of period, Total 160,121      
Accumulated Depreciation and Amortization $ 24,840      
Life on which depreciation in latest income statements is computed 35 years      
Mount Vernon/South Valley/7770 Richmond Hwy,        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 10,068      
Initial cost to company, Buildings and Improvements 33,501      
Cost Capitalized Subsequent to Acquisition 41,132      
Gross amount at which carried at close of period, Land 10,230      
Gross amount at which carried at close of period, Buildings and Improvements 74,471      
Gross amount at which carried at close of period, Total 84,701      
Accumulated Depreciation and Amortization $ 34,011      
Life on which depreciation in latest income statements is computed 35 years      
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 $ 0      
Life on which depreciation in latest income statements is computed      
Northeast        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 1,152      
Initial cost to company, Buildings and Improvements 10,596      
Cost Capitalized Subsequent to Acquisition 18,679      
Gross amount at which carried at close of period, Land 1,153      
Gross amount at which carried at close of period, Buildings and Improvements 29,274      
Gross amount at which carried at close of period, Total 30,427      
Accumulated Depreciation and Amortization $ 20,496      
Life on which depreciation in latest income statements is computed 35 years      
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 6,212      
Gross amount at which carried at close of period, Land 638      
Gross amount at which carried at close of period, Buildings and Improvements 7,210      
Gross amount at which carried at close of period, Total 7,848      
Accumulated Depreciation and Amortization $ 5,418      
Life on which depreciation in latest income statements is computed 33 years 4 months      
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 30,997      
Gross amount at which carried at close of period, Land 3,420      
Gross amount at which carried at close of period, Buildings and Improvements 33,762      
Gross amount at which carried at close of period, Total 37,182      
Accumulated Depreciation and Amortization $ 21,217      
Life on which depreciation in latest income statements is computed 35 years      
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 10,358      
Gross amount at which carried at close of period, Land 15,048      
Gross amount at which carried at close of period, Buildings and Improvements 57,090      
Gross amount at which carried at close of period, Total 72,138      
Accumulated Depreciation and Amortization $ 213      
Life on which depreciation in latest income statements is computed 35 years      
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 7,610      
Gross amount at which carried at close of period, Land 8,695      
Gross amount at which carried at close of period, Buildings and Improvements 20,538      
Gross amount at which carried at close of period, Total 29,233      
Accumulated Depreciation and Amortization $ 15,159      
Life on which depreciation in latest income statements is computed 35 years      
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 100,369      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 103,324      
Gross amount at which carried at close of period, Total 103,324      
Accumulated Depreciation and Amortization $ 46,051      
Life on which depreciation in latest income statements is computed 35 years      
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 21,836      
Gross amount at which carried at close of period, Land 2,800      
Gross amount at which carried at close of period, Buildings and Improvements 28,297      
Gross amount at which carried at close of period, Total 31,097      
Accumulated Depreciation and Amortization $ 23,112      
Life on which depreciation in latest income statements is computed 35 years      
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 543,484      
Gross amount at which carried at close of period, Land 29,903      
Gross amount at which carried at close of period, Buildings and Improvements 555,387      
Gross amount at which carried at close of period, Total 585,290      
Accumulated Depreciation and Amortization $ 23,148      
Life on which depreciation in latest income statements is computed 50 years      
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 6,929      
Gross amount at which carried at close of period, Land 14,914      
Gross amount at which carried at close of period, Buildings and Improvements 29,784      
Gross amount at which carried at close of period, Total 44,698      
Accumulated Depreciation and Amortization $ 16,745      
Life on which depreciation in latest income statements is computed 35 years      
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 14,329      
Gross amount at which carried at close of period, Land 10,305      
Gross amount at which carried at close of period, Buildings and Improvements 35,882      
Gross amount at which carried at close of period, Total 46,187      
Accumulated Depreciation and Amortization $ 2,341      
Life on which depreciation in latest income statements is computed 35 years      
Plaza Del Sol        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 8,746      
Initial cost to company, Land 5,605      
Initial cost to company, Buildings and Improvements 12,331      
Cost Capitalized Subsequent to Acquisition 0      
Gross amount at which carried at close of period, Land 5,605      
Gross amount at which carried at close of period, Buildings and Improvements 12,331      
Gross amount at which carried at close of period, Total 17,936      
Accumulated Depreciation and Amortization $ 212      
Life on which depreciation in latest income statements is computed 35 years      
Plaza El Segundo/The Point        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 124,151      
Initial cost to company, Land 62,127      
Initial cost to company, Buildings and Improvements 153,556      
Cost Capitalized Subsequent to Acquisition 65,337      
Gross amount at which carried at close of period, Land 64,463      
Gross amount at which carried at close of period, Buildings and Improvements 216,557      
Gross amount at which carried at close of period, Total 281,020      
Accumulated Depreciation and Amortization $ 39,623      
Life on which depreciation in latest income statements is computed 35 years      
Plaza Pacoima        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 38,138      
Initial cost to company, Buildings and Improvements 12,227      
Cost Capitalized Subsequent to Acquisition 0      
Gross amount at which carried at close of period, Land 38,138      
Gross amount at which carried at close of period, Buildings and Improvements 12,227      
Gross amount at which carried at close of period, Total 50,365      
Accumulated Depreciation and Amortization $ 225      
Life on which depreciation in latest income statements is computed 35 years      
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 6,519      
Gross amount at which carried at close of period, Land 3,319      
Gross amount at which carried at close of period, Buildings and Improvements 14,976      
Gross amount at which carried at close of period, Total 18,295      
Accumulated Depreciation and Amortization $ 9,881      
Life on which depreciation in latest income statements is computed 35 years      
Quince Orchard Plaza        
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 27,772      
Gross amount at which carried at close of period, Land 2,928      
Gross amount at which carried at close of period, Buildings and Improvements 35,990      
Gross amount at which carried at close of period, Total 38,918      
Accumulated Depreciation and Amortization $ 19,478      
Life on which depreciation in latest income statements is computed 35 years      
Riverpoint Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 15,422      
Initial cost to company, Buildings and Improvements 104,575      
Cost Capitalized Subsequent to Acquisition 82      
Gross amount at which carried at close of period, Land 15,422      
Gross amount at which carried at close of period, Buildings and Improvements 104,657      
Gross amount at which carried at close of period, Total 120,079      
Accumulated Depreciation and Amortization $ 2,626      
Life on which depreciation in latest income statements is computed 35 years      
Rockville Town Square        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 4,455      
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 8,092      
Cost Capitalized Subsequent to Acquisition 43,010      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 51,102      
Gross amount at which carried at close of period, Total 51,102      
Accumulated Depreciation and Amortization $ 16,823      
Life on which depreciation in latest income statements is computed 50 years      
Rollingwood Apts.        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 20,785      
Initial cost to company, Land 552      
Initial cost to company, Buildings and Improvements 2,246      
Cost Capitalized Subsequent to Acquisition 7,988      
Gross amount at which carried at close of period, Land 572      
Gross amount at which carried at close of period, Buildings and Improvements 10,214      
Gross amount at which carried at close of period, Total 10,786      
Accumulated Depreciation and Amortization $ 9,358      
Life on which depreciation in latest income statements is computed 25 years      
Sam's Park and Shop        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 4,840      
Initial cost to company, Buildings and Improvements 6,319      
Cost Capitalized Subsequent to Acquisition 1,679      
Gross amount at which carried at close of period, Land 4,840      
Gross amount at which carried at close of period, Buildings and Improvements 7,998      
Gross amount at which carried at close of period, Total 12,838      
Accumulated Depreciation and Amortization $ 5,158      
Life on which depreciation in latest income statements is computed 35 years      
San Antonio Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 39,920      
Initial cost to company, Buildings and Improvements 32,466      
Cost Capitalized Subsequent to Acquisition 1,334      
Gross amount at which carried at close of period, Land 39,920      
Gross amount at which carried at close of period, Buildings and Improvements 33,800      
Gross amount at which carried at close of period, Total 73,720      
Accumulated Depreciation and Amortization $ 4,714      
Life on which depreciation in latest income statements is computed 35 years      
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 788,049      
Gross amount at which carried at close of period, Land 57,578      
Gross amount at which carried at close of period, Buildings and Improvements 804,655      
Gross amount at which carried at close of period, Total 862,233      
Accumulated Depreciation and Amortization $ 182,514      
Santana Row | Minimum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statements is computed 40 years      
Santana Row | Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statements is computed 50 years      
Saugus        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 4,383      
Initial cost to company, Buildings and Improvements 8,291      
Cost Capitalized Subsequent to Acquisition 2,588      
Gross amount at which carried at close of period, Land 4,383      
Gross amount at which carried at close of period, Buildings and Improvements 10,879      
Gross amount at which carried at close of period, Total 15,262      
Accumulated Depreciation and Amortization $ 6,702      
Life on which depreciation in latest income statements is computed 35 years      
Sylmar Towne Center        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 18,010      
Initial cost to company, Land 18,522      
Initial cost to company, Buildings and Improvements 24,636      
Cost Capitalized Subsequent to Acquisition 376      
Gross amount at which carried at close of period, Land 18,522      
Gross amount at which carried at close of period, Buildings and Improvements 25,012      
Gross amount at which carried at close of period, Total 43,534      
Accumulated Depreciation and Amortization $ 389      
Life on which depreciation in latest income statements is computed 35 years      
The Avenue at White Marsh        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 52,489      
Initial cost to company, Land 20,682      
Initial cost to company, Buildings and Improvements 72,432      
Cost Capitalized Subsequent to Acquisition 23,014      
Gross amount at which carried at close of period, Land 20,685      
Gross amount at which carried at close of period, Buildings and Improvements 95,443      
Gross amount at which carried at close of period, Total 116,128      
Accumulated Depreciation and Amortization $ 32,066      
Life on which depreciation in latest income statements is computed 35 years      
The Grove at Shrewsbury        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 53,218      
Initial cost to company, Land 18,016      
Initial cost to company, Buildings and Improvements 103,115      
Cost Capitalized Subsequent to Acquisition 3,886      
Gross amount at which carried at close of period, Land 18,021      
Gross amount at which carried at close of period, Buildings and Improvements 106,996      
Gross amount at which carried at close of period, Total 125,017      
Accumulated Depreciation and Amortization $ 13,884      
Life on which depreciation in latest income statements is computed 35 years      
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 254      
Gross amount at which carried at close of period, Land 4,441      
Gross amount at which carried at close of period, Buildings and Improvements 13,103      
Gross amount at which carried at close of period, Total 17,544      
Accumulated Depreciation and Amortization $ 4,912      
Life on which depreciation in latest income statements is computed 35 years      
The Shops at Sunset Place        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 69,149      
Initial cost to company, Land 64,499      
Initial cost to company, Buildings and Improvements 50,853      
Cost Capitalized Subsequent to Acquisition 8,160      
Gross amount at which carried at close of period, Land 64,499      
Gross amount at which carried at close of period, Buildings and Improvements 59,013      
Gross amount at which carried at close of period, Total 123,512      
Accumulated Depreciation and Amortization $ 6,629      
Life on which depreciation in latest income statements is computed 35 years      
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 43,309      
Gross amount at which carried at close of period, Land 25,125      
Gross amount at which carried at close of period, Buildings and Improvements 53,538      
Gross amount at which carried at close of period, Total 78,663      
Accumulated Depreciation and Amortization $ 32,281      
Life on which depreciation in latest income statements is computed 35 years      
Tower        
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 4,240      
Gross amount at which carried at close of period, Land 7,280      
Gross amount at which carried at close of period, Buildings and Improvements 14,648      
Gross amount at which carried at close of period, Total 21,928      
Accumulated Depreciation and Amortization $ 8,738      
Life on which depreciation in latest income statements is computed 35 years      
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 24,219      
Gross amount at which carried at close of period, Land 29,962      
Gross amount at which carried at close of period, Buildings and Improvements 67,587      
Gross amount at which carried at close of period, Total 97,549      
Accumulated Depreciation and Amortization $ 15,761      
Life on which depreciation in latest income statements is computed 35 years      
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 1,679      
Gross amount at which carried at close of period, Land 1,470      
Gross amount at which carried at close of period, Buildings and Improvements 13,776      
Gross amount at which carried at close of period, Total 15,246      
Accumulated Depreciation and Amortization $ 5,087      
Life on which depreciation in latest income statements is computed 35 years      
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 20,048      
Gross amount at which carried at close of period, Land 2,328      
Gross amount at which carried at close of period, Buildings and Improvements 20,048      
Gross amount at which carried at close of period, Total 22,376      
Accumulated Depreciation and Amortization $ 221      
Life on which depreciation in latest income statements is computed 35 years      
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 28,424      
Gross amount at which carried at close of period, Land 5,865      
Gross amount at which carried at close of period, Buildings and Improvements 30,878      
Gross amount at which carried at close of period, Total 36,743      
Accumulated Depreciation and Amortization $ 21,234      
Life on which depreciation in latest income statements is computed 22 years      
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 3,825      
Gross amount at which carried at close of period, Land 475      
Gross amount at which carried at close of period, Buildings and Improvements 4,191      
Gross amount at which carried at close of period, Total 4,666      
Accumulated Depreciation and Amortization $ 3,737      
Life on which depreciation in latest income statements is computed 17 years      
Village at Shirlington        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 6,646      
Initial cost to company, Land 9,761      
Initial cost to company, Buildings and Improvements 14,808      
Cost Capitalized Subsequent to Acquisition 40,418      
Gross amount at which carried at close of period, Land 4,234      
Gross amount at which carried at close of period, Buildings and Improvements 60,753      
Gross amount at which carried at close of period, Total 64,987      
Accumulated Depreciation and Amortization $ 27,322      
Life on which depreciation in latest income statements is computed 35 years      
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 39,726      
Gross amount at which carried at close of period, Land 6,319      
Gross amount at which carried at close of period, Buildings and Improvements 147,010      
Gross amount at which carried at close of period, Total 153,329      
Accumulated Depreciation and Amortization $ 48,562      
Life on which depreciation in latest income statements is computed 35 years      
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 645      
Gross amount at which carried at close of period, Land 3,478      
Gross amount at which carried at close of period, Buildings and Improvements 22,058      
Gross amount at which carried at close of period, Total 25,536      
Accumulated Depreciation and Amortization $ 8,491      
Life on which depreciation in latest income statements is computed 35 years      
White Marsh Other        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land $ 31,953      
Initial cost to company, Buildings and Improvements 1,843      
Cost Capitalized Subsequent to Acquisition 140      
Gross amount at which carried at close of period, Land 31,983      
Gross amount at which carried at close of period, Buildings and Improvements 1,953      
Gross amount at which carried at close of period, Total 33,936      
Accumulated Depreciation and Amortization $ 811      
Life on which depreciation in latest income statements is computed 35 years      
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 10,291      
Gross amount at which carried at close of period, Land 9,111      
Gross amount at which carried at close of period, Buildings and Improvements 11,352      
Gross amount at which carried at close of period, Total 20,463      
Accumulated Depreciation and Amortization $ 8,839      
Life on which depreciation in latest income statements is computed 33 years 4 months      
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 22,115      
Gross amount at which carried at close of period, Land 1,499      
Gross amount at which carried at close of period, Buildings and Improvements 28,758      
Gross amount at which carried at close of period, Total 30,257      
Accumulated Depreciation and Amortization $ 26,206      
Life on which depreciation in latest income statements is computed 35 years      
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 84,407      
Gross amount at which carried at close of period, Land 7,790      
Gross amount at which carried at close of period, Buildings and Improvements 87,532      
Gross amount at which carried at close of period, Total 95,322      
Accumulated Depreciation and Amortization $ 56,879      
Life on which depreciation in latest income statements is computed 35 years      
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 21,092      
Gross amount at which carried at close of period, Land 8,055      
Gross amount at which carried at close of period, Buildings and Improvements 34,851      
Gross amount at which carried at close of period, Total 42,906      
Accumulated Depreciation and Amortization $ 23,196      
Life on which depreciation in latest income statements is computed 35 years