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Schedule III - Summary of Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 545,898 $ 563,061    
Initial cost to company, Land 1,459,321      
Initial cost to company, Buildings and Improvements 2,416,071      
Cost Capitalized Subsequent to Acquisition 3,944,080      
Gross amount at which carried at close of period, Land 1,422,834      
Gross amount at which carried at close of period, Buildings and Improvements 6,396,638      
Gross amount at which carried at close of period, Total 7,819,472 7,635,061 $ 6,759,073 $ 6,064,406
Accumulated Depreciation and Amortization 2,059,143 $ 1,876,544 $ 1,729,234 $ 1,574,041
29th Place        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 4,097      
Initial cost to company, Land 10,211      
Initial cost to company, Buildings and Improvements 18,863      
Cost Capitalized Subsequent to Acquisition 11,777      
Gross amount at which carried at close of period, Land 10,195      
Gross amount at which carried at close of period, Buildings and Improvements 30,656      
Gross amount at which carried at close of period, Total 40,851      
Accumulated Depreciation and Amortization $ 13,410      
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 10,857      
Gross amount at which carried at close of period, Land 2,432      
Gross amount at which carried at close of period, Buildings and Improvements 23,203      
Gross amount at which carried at close of period, Total 25,635      
Accumulated Depreciation and Amortization $ 19,686      
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 573,115      
Gross amount at which carried at close of period, Land 69,421      
Gross amount at which carried at close of period, Buildings and Improvements 631,142      
Gross amount at which carried at close of period, Total 700,563      
Accumulated Depreciation and Amortization $ 57,207      
Life on which depreciation in latest income statements is computed 35 years      
Azalea        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 39,655      
Initial cost to company, Land 40,219      
Initial cost to company, Buildings and Improvements 67,117      
Cost Capitalized Subsequent to Acquisition 115      
Gross amount at which carried at close of period, Land 40,219      
Gross amount at which carried at close of period, Buildings and Improvements 67,232      
Gross amount at which carried at close of period, Total 107,451      
Accumulated Depreciation and Amortization $ 3,586      
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 25,570      
Gross amount at which carried at close of period, Land 2,683      
Gross amount at which carried at close of period, Buildings and Improvements 40,918      
Gross amount at which carried at close of period, Total 43,601      
Accumulated Depreciation and Amortization $ 21,709      
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 4,472      
Gross amount at which carried at close of period, Land 12,617      
Gross amount at which carried at close of period, Buildings and Improvements 34,075      
Gross amount at which carried at close of period, Total 46,692      
Accumulated Depreciation and Amortization $ 3,232      
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 47,397      
Gross amount at which carried at close of period, Land 4,363      
Gross amount at which carried at close of period, Buildings and Improvements 63,856      
Gross amount at which carried at close of period, Total 68,219      
Accumulated Depreciation and Amortization $ 44,674      
Life on which depreciation in latest income statements is computed 35 years      
Bell Gardens        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 12,492      
Initial cost to company, Land 24,403      
Initial cost to company, Buildings and Improvements 85,947      
Cost Capitalized Subsequent to Acquisition 183      
Gross amount at which carried at close of period, Land 24,403      
Gross amount at which carried at close of period, Buildings and Improvements 86,130      
Gross amount at which carried at close of period, Total 110,533      
Accumulated Depreciation and Amortization $ 6,000      
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 146,423      
Gross amount at which carried at close of period, Land 43,904      
Gross amount at which carried at close of period, Buildings and Improvements 184,504      
Gross amount at which carried at close of period, Total 228,408      
Accumulated Depreciation and Amortization $ 79,230      
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 60,396      
Gross amount at which carried at close of period, Land 4,094      
Gross amount at which carried at close of period, Buildings and Improvements 81,017      
Gross amount at which carried at close of period, Total 85,111      
Accumulated Depreciation and Amortization $ 49,569      
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 12,156      
Gross amount at which carried at close of period, Land 3,856      
Gross amount at which carried at close of period, Buildings and Improvements 28,115      
Gross amount at which carried at close of period, Total 31,971      
Accumulated Depreciation and Amortization $ 18,839      
Life on which depreciation in latest income statements is computed 35 years      
Brook 35        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 11,283      
Initial cost to company, Land 7,128      
Initial cost to company, Buildings and Improvements 38,355      
Cost Capitalized Subsequent to Acquisition 2,548      
Gross amount at which carried at close of period, Land 7,128      
Gross amount at which carried at close of period, Buildings and Improvements 40,903      
Gross amount at which carried at close of period, Total 48,031      
Accumulated Depreciation and Amortization $ 6,860      
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 314      
Gross amount at which carried at close of period, Land 16,710      
Gross amount at which carried at close of period, Buildings and Improvements 13,726      
Gross amount at which carried at close of period, Total 30,436      
Accumulated Depreciation and Amortization $ 1,826      
Life on which depreciation in latest income statements is computed 35 years      
Chelsea Commons        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 5,729      
Initial cost to company, Land 8,689      
Initial cost to company, Buildings and Improvements 19,466      
Cost Capitalized Subsequent to Acquisition 1,626      
Gross amount at which carried at close of period, Land 8,669      
Gross amount at which carried at close of period, Buildings and Improvements 21,112      
Gross amount at which carried at close of period, Total 29,781      
Accumulated Depreciation and Amortization $ 7,722      
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 23,773      
Gross amount at which carried at close of period, Land 34,406      
Gross amount at which carried at close of period, Buildings and Improvements 95,906      
Gross amount at which carried at close of period, Total 130,312      
Accumulated Depreciation and Amortization $ 8,379      
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 10,209      
Gross amount at which carried at close of period, Land 5,262      
Gross amount at which carried at close of period, Buildings and Improvements 14,280      
Gross amount at which carried at close of period, Total 19,542      
Accumulated Depreciation and Amortization $ 11,088      
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 92,870      
Gross amount at which carried at close of period, Land 1,020      
Gross amount at which carried at close of period, Buildings and Improvements 102,067      
Gross amount at which carried at close of period, Total 103,087      
Accumulated Depreciation and Amortization $ 56,821      
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 2,866      
Gross amount at which carried at close of period, Land 1,750      
Gross amount at which carried at close of period, Buildings and Improvements 4,735      
Gross amount at which carried at close of period, Total 6,485      
Accumulated Depreciation and Amortization $ 2,115      
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 18,490      
Gross amount at which carried at close of period, Land 4,635      
Gross amount at which carried at close of period, Buildings and Improvements 30,101      
Gross amount at which carried at close of period, Total 34,736      
Accumulated Depreciation and Amortization $ 17,297      
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 8,065      
Gross amount at which carried at close of period, Land 27,245      
Gross amount at which carried at close of period, Buildings and Improvements 62,640      
Gross amount at which carried at close of period, Total 89,885      
Accumulated Depreciation and Amortization $ 23,626      
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 $ 30,368      
Initial cost to company, Buildings and Improvements 19,523      
Cost Capitalized Subsequent to Acquisition 4,278      
Gross amount at which carried at close of period, Land 30,368      
Gross amount at which carried at close of period, Buildings and Improvements 23,801      
Gross amount at which carried at close of period, Total 54,169      
Accumulated Depreciation and Amortization $ 3,722      
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 14,925      
Gross amount at which carried at close of period, Land 14,841      
Gross amount at which carried at close of period, Buildings and Improvements 27,843      
Gross amount at which carried at close of period, Total 42,684      
Accumulated Depreciation and Amortization $ 16,192      
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 13,638      
Gross amount at which carried at close of period, Land 15,587      
Gross amount at which carried at close of period, Buildings and Improvements 55,387      
Gross amount at which carried at close of period, Total 70,974      
Accumulated Depreciation and Amortization $ 22,290      
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 11,919      
Gross amount at which carried at close of period, Land 29,079      
Gross amount at which carried at close of period, Buildings and Improvements 149,954      
Gross amount at which carried at close of period, Total 179,033      
Accumulated Depreciation and Amortization $ 30,706      
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 27,193      
Gross amount at which carried at close of period, Land 1,608      
Gross amount at which carried at close of period, Buildings and Improvements 32,968      
Gross amount at which carried at close of period, Total 34,576      
Accumulated Depreciation and Amortization $ 20,680      
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 18,877      
Gross amount at which carried at close of period, Land 4,013      
Gross amount at which carried at close of period, Buildings and Improvements 30,201      
Gross amount at which carried at close of period, Total 34,214      
Accumulated Depreciation and Amortization $ 20,892      
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 16,057      
Gross amount at which carried at close of period, Land 19,117      
Gross amount at which carried at close of period, Buildings and Improvements 31,886      
Gross amount at which carried at close of period, Total 51,003      
Accumulated Depreciation and Amortization $ 17,459      
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 10,880      
Gross amount at which carried at close of period, Land 1,819      
Gross amount at which carried at close of period, Buildings and Improvements 12,129      
Gross amount at which carried at close of period, Total 13,948      
Accumulated Depreciation and Amortization $ 8,897      
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 42,145      
Gross amount at which carried at close of period, Land 10,216      
Gross amount at which carried at close of period, Buildings and Improvements 60,040      
Gross amount at which carried at close of period, Total 70,256      
Accumulated Depreciation and Amortization $ 44,673      
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 20,417      
Gross amount at which carried at close of period, Land 9,252      
Gross amount at which carried at close of period, Buildings and Improvements 29,961      
Gross amount at which carried at close of period, Total 39,213      
Accumulated Depreciation and Amortization $ 21,116      
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 11,699      
Gross amount at which carried at close of period, Land 1,507      
Gross amount at which carried at close of period, Buildings and Improvements 15,480      
Gross amount at which carried at close of period, Total 16,987      
Accumulated Depreciation and Amortization $ 6,517      
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 $ 13,978      
Initial cost to company, Buildings and Improvements 9,909      
Cost Capitalized Subsequent to Acquisition 104      
Gross amount at which carried at close of period, Land 13,978      
Gross amount at which carried at close of period, Buildings and Improvements 10,013      
Gross amount at which carried at close of period, Total 23,991      
Accumulated Depreciation and Amortization $ 635      
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 5,271      
Gross amount at which carried at close of period, Land 18,581      
Gross amount at which carried at close of period, Buildings and Improvements 46,929      
Gross amount at which carried at close of period, Total 65,510      
Accumulated Depreciation and Amortization $ 5,530      
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 41,722      
Gross amount at which carried at close of period, Land 24,633      
Gross amount at which carried at close of period, Buildings and Improvements 66,969      
Gross amount at which carried at close of period, Total 91,602      
Accumulated Depreciation and Amortization $ 40,833      
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 4,610      
Gross amount at which carried at close of period, Land 12,696      
Gross amount at which carried at close of period, Buildings and Improvements 25,413      
Gross amount at which carried at close of period, Total 38,109      
Accumulated Depreciation and Amortization $ 12,944      
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 15,716      
Gross amount at which carried at close of period, Land 5,973      
Gross amount at which carried at close of period, Buildings and Improvements 22,715      
Gross amount at which carried at close of period, Total 28,688      
Accumulated Depreciation and Amortization $ 18,358      
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 7,173      
Gross amount at which carried at close of period, Land 2,677      
Gross amount at which carried at close of period, Buildings and Improvements 12,002      
Gross amount at which carried at close of period, Total 14,679      
Accumulated Depreciation and Amortization $ 8,030      
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 20,363      
Gross amount at which carried at close of period, Land 2,068      
Gross amount at which carried at close of period, Buildings and Improvements 25,268      
Gross amount at which carried at close of period, Total 27,336      
Accumulated Depreciation and Amortization $ 21,247      
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 19,277      
Gross amount at which carried at close of period, Land 1,169      
Gross amount at which carried at close of period, Buildings and Improvements 34,441      
Gross amount at which carried at close of period, Total 35,610      
Accumulated Depreciation and Amortization $ 27,995      
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 17,840      
Gross amount at which carried at close of period, Land 525      
Gross amount at which carried at close of period, Buildings and Improvements 19,441      
Gross amount at which carried at close of period, Total 19,966      
Accumulated Depreciation and Amortization $ 17,770      
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 380      
Gross amount at which carried at close of period, Land 10,590      
Gross amount at which carried at close of period, Buildings and Improvements 21,249      
Gross amount at which carried at close of period, Total 31,839      
Accumulated Depreciation and Amortization $ 2,618      
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 $ 4,360      
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 269      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 22,662      
Gross amount at which carried at close of period, Total 22,662      
Accumulated Depreciation and Amortization $ 1,476      
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 5,125      
Gross amount at which carried at close of period, Land 8,419      
Gross amount at which carried at close of period, Buildings and Improvements 20,759      
Gross amount at which carried at close of period, Total 29,178      
Accumulated Depreciation and Amortization $ 12,449      
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 4,829      
Gross amount at which carried at close of period, Land 1,368      
Gross amount at which carried at close of period, Buildings and Improvements 4,857      
Gross amount at which carried at close of period, Total 6,225      
Accumulated Depreciation and Amortization $ 3,528      
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 21,492      
Gross amount at which carried at close of period, Land 8,370      
Gross amount at which carried at close of period, Buildings and Improvements 38,342      
Gross amount at which carried at close of period, Total 46,712      
Accumulated Depreciation and Amortization $ 15,374      
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 18,537      
Gross amount at which carried at close of period, Land 12,194      
Gross amount at which carried at close of period, Buildings and Improvements 34,545      
Gross amount at which carried at close of period, Total 46,739      
Accumulated Depreciation and Amortization $ 16,411      
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 2,748      
Gross amount at which carried at close of period, Land 506      
Gross amount at which carried at close of period, Buildings and Improvements 12,317      
Gross amount at which carried at close of period, Total 12,823      
Accumulated Depreciation and Amortization $ 3,780      
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 2,753      
Gross amount at which carried at close of period, Land 4,308      
Gross amount at which carried at close of period, Buildings and Improvements 12,779      
Gross amount at which carried at close of period, Total 17,087      
Accumulated Depreciation and Amortization $ 9,325      
Life on which depreciation in latest income statements is computed 35 years      
Jordan Downs 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 11,697      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 14,952      
Gross amount at which carried at close of period, Total 14,952      
Accumulated Depreciation and Amortization 0      
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 884      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 11,598      
Gross amount at which carried at close of period, Total 11,598      
Accumulated Depreciation and Amortization $ 9,139      
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 11,614      
Gross amount at which carried at close of period, Land 432      
Gross amount at which carried at close of period, Buildings and Improvements 13,285      
Gross amount at which carried at close of period, Total 13,717      
Accumulated Depreciation and Amortization $ 8,070      
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 18,742      
Gross amount at which carried at close of period, Land 720      
Gross amount at which carried at close of period, Buildings and Improvements 21,716      
Gross amount at which carried at close of period, Total 22,436      
Accumulated Depreciation and Amortization $ 15,900      
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 27,843      
Gross amount at which carried at close of period, Land 7,462      
Gross amount at which carried at close of period, Buildings and Improvements 50,364      
Gross amount at which carried at close of period, Total 57,826      
Accumulated Depreciation and Amortization $ 38,950      
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 18,572      
Gross amount at which carried at close of period, Land 6,161      
Gross amount at which carried at close of period, Buildings and Improvements 27,052      
Gross amount at which carried at close of period, Total 33,213      
Accumulated Depreciation and Amortization $ 22,745      
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 17,918      
Gross amount at which carried at close of period, Land 8,184      
Gross amount at which carried at close of period, Buildings and Improvements 28,640      
Gross amount at which carried at close of period, Total 36,824      
Accumulated Depreciation and Amortization $ 15,528      
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 50,936      
Gross amount at which carried at close of period, Land 79,346      
Gross amount at which carried at close of period, Buildings and Improvements 70,219      
Gross amount at which carried at close of period, Total 149,565      
Accumulated Depreciation and Amortization $ 24,578      
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 23,485      
Gross amount at which carried at close of period, Land 35,622      
Gross amount at which carried at close of period, Buildings and Improvements 56,367      
Gross amount at which carried at close of period, Total 91,989      
Accumulated Depreciation and Amortization $ 14,734      
Life on which depreciation in latest income statements is computed 35 years      
Mercer Mall        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 55,472      
Initial cost to company, Land 29,738      
Initial cost to company, Buildings and Improvements 51,047      
Cost Capitalized Subsequent to Acquisition 47,401      
Gross amount at which carried at close of period, Land 29,738      
Gross amount at which carried at close of period, Buildings and Improvements 98,448      
Gross amount at which carried at close of period, Total 128,186      
Accumulated Depreciation and Amortization $ 44,812      
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 $ 69,310      
Initial cost to company, Land 48,624      
Initial cost to company, Buildings and Improvements 91,819      
Cost Capitalized Subsequent to Acquisition 21,542      
Gross amount at which carried at close of period, Land 48,624      
Gross amount at which carried at close of period, Buildings and Improvements 113,361      
Gross amount at which carried at close of period, Total 161,985      
Accumulated Depreciation and Amortization $ 28,916      
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 41,621      
Gross amount at which carried at close of period, Land 10,150      
Gross amount at which carried at close of period, Buildings and Improvements 75,040      
Gross amount at which carried at close of period, Total 85,190      
Accumulated Depreciation and Amortization $ 36,802      
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 $ 1      
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 21,987      
Gross amount at which carried at close of period, Land 1,153      
Gross amount at which carried at close of period, Buildings and Improvements 32,582      
Gross amount at which carried at close of period, Total 33,735      
Accumulated Depreciation and Amortization $ 21,280      
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 7,151      
Gross amount at which carried at close of period, Land 638      
Gross amount at which carried at close of period, Buildings and Improvements 8,149      
Gross amount at which carried at close of period, Total 8,787      
Accumulated Depreciation and Amortization $ 5,715      
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 29,663      
Gross amount at which carried at close of period, Land 3,420      
Gross amount at which carried at close of period, Buildings and Improvements 32,428      
Gross amount at which carried at close of period, Total 35,848      
Accumulated Depreciation and Amortization $ 22,076      
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 15,215      
Gross amount at which carried at close of period, Land 15,048      
Gross amount at which carried at close of period, Buildings and Improvements 61,947      
Gross amount at which carried at close of period, Total 76,995      
Accumulated Depreciation and Amortization $ 1,453      
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 7,892      
Gross amount at which carried at close of period, Land 8,695      
Gross amount at which carried at close of period, Buildings and Improvements 20,820      
Gross amount at which carried at close of period, Total 29,515      
Accumulated Depreciation and Amortization $ 15,818      
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 103,348      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 106,303      
Gross amount at which carried at close of period, Total 106,303      
Accumulated Depreciation and Amortization $ 49,449      
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 21,898      
Gross amount at which carried at close of period, Land 2,800      
Gross amount at which carried at close of period, Buildings and Improvements 28,359      
Gross amount at which carried at close of period, Total 31,159      
Accumulated Depreciation and Amortization $ 24,001      
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 524,922      
Gross amount at which carried at close of period, Land 27,929      
Gross amount at which carried at close of period, Buildings and Improvements 538,799      
Gross amount at which carried at close of period, Total 566,728      
Accumulated Depreciation and Amortization $ 36,543      
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 10,274      
Gross amount at which carried at close of period, Land 14,914      
Gross amount at which carried at close of period, Buildings and Improvements 33,129      
Gross amount at which carried at close of period, Total 48,043      
Accumulated Depreciation and Amortization $ 17,690      
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 14,705      
Gross amount at which carried at close of period, Land 10,305      
Gross amount at which carried at close of period, Buildings and Improvements 36,258      
Gross amount at which carried at close of period, Total 46,563      
Accumulated Depreciation and Amortization $ 3,964      
Life on which depreciation in latest income statements is computed 35 years      
Plaza Del Sol        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 8,532      
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 $ 720      
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 $ 124,244      
Initial cost to company, Land 62,127      
Initial cost to company, Buildings and Improvements 153,556      
Cost Capitalized Subsequent to Acquisition 70,231      
Gross amount at which carried at close of period, Land 64,463      
Gross amount at which carried at close of period, Buildings and Improvements 221,451      
Gross amount at which carried at close of period, Total 285,914      
Accumulated Depreciation and Amortization $ 46,765      
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 $ 773      
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 6,525      
Gross amount at which carried at close of period, Land 3,319      
Gross amount at which carried at close of period, Buildings and Improvements 14,982      
Gross amount at which carried at close of period, Total 18,301      
Accumulated Depreciation and Amortization $ 10,359      
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 28,316      
Gross amount at which carried at close of period, Land 2,928      
Gross amount at which carried at close of period, Buildings and Improvements 36,534      
Gross amount at which carried at close of period, Total 39,462      
Accumulated Depreciation and Amortization $ 21,216      
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 104,572      
Cost Capitalized Subsequent to Acquisition 664      
Gross amount at which carried at close of period, Land 15,422      
Gross amount at which carried at close of period, Buildings and Improvements 105,236      
Gross amount at which carried at close of period, Total 120,658      
Accumulated Depreciation and Amortization $ 6,046      
Life on which depreciation in latest income statements is computed 35 years      
Rockville Town Square        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 4,436      
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 8,092      
Cost Capitalized Subsequent to Acquisition 44,099      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 52,191      
Gross amount at which carried at close of period, Total 52,191      
Accumulated Depreciation and Amortization $ 19,088      
Life on which depreciation in latest income statements is computed 50 years      
Rollingwood Apts.        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 20,326      
Initial cost to company, Land 552      
Initial cost to company, Buildings and Improvements 2,246      
Cost Capitalized Subsequent to Acquisition 8,302      
Gross amount at which carried at close of period, Land 774      
Gross amount at which carried at close of period, Buildings and Improvements 10,326      
Gross amount at which carried at close of period, Total 11,100      
Accumulated Depreciation and Amortization $ 9,653      
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 2,697      
Gross amount at which carried at close of period, Land 4,840      
Gross amount at which carried at close of period, Buildings and Improvements 9,016      
Gross amount at which carried at close of period, Total 13,856      
Accumulated Depreciation and Amortization $ 5,518      
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 1,919      
Gross amount at which carried at close of period, Land 39,920      
Gross amount at which carried at close of period, Buildings and Improvements 34,385      
Gross amount at which carried at close of period, Total 74,305      
Accumulated Depreciation and Amortization $ 6,207      
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 887,246      
Gross amount at which carried at close of period, Land 53,217      
Gross amount at which carried at close of period, Buildings and Improvements 908,213      
Gross amount at which carried at close of period, Total 961,430      
Accumulated Depreciation and Amortization $ 200,651      
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 3,050      
Gross amount at which carried at close of period, Land 4,383      
Gross amount at which carried at close of period, Buildings and Improvements 11,341      
Gross amount at which carried at close of period, Total 15,724      
Accumulated Depreciation and Amortization $ 7,092      
Life on which depreciation in latest income statements is computed 35 years      
Sylmar Towne Center        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 17,446      
Initial cost to company, Land 18,522      
Initial cost to company, Buildings and Improvements 24,636      
Cost Capitalized Subsequent to Acquisition 325      
Gross amount at which carried at close of period, Land 18,522      
Gross amount at which carried at close of period, Buildings and Improvements 24,961      
Gross amount at which carried at close of period, Total 43,483      
Accumulated Depreciation and Amortization $ 1,319      
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 $ 52,543      
Initial cost to company, Land 20,682      
Initial cost to company, Buildings and Improvements 72,432      
Cost Capitalized Subsequent to Acquisition 26,626      
Gross amount at which carried at close of period, Land 20,685      
Gross amount at which carried at close of period, Buildings and Improvements 99,055      
Gross amount at which carried at close of period, Total 119,740      
Accumulated Depreciation and Amortization $ 35,323      
Life on which depreciation in latest income statements is computed 35 years      
The Grove at Shrewsbury        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 42,776      
Initial cost to company, Land 18,016      
Initial cost to company, Buildings and Improvements 103,115      
Cost Capitalized Subsequent to Acquisition 4,223      
Gross amount at which carried at close of period, Land 18,021      
Gross amount at which carried at close of period, Buildings and Improvements 107,333      
Gross amount at which carried at close of period, Total 125,354      
Accumulated Depreciation and Amortization $ 17,289      
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 403      
Gross amount at which carried at close of period, Land 4,441      
Gross amount at which carried at close of period, Buildings and Improvements 13,252      
Gross amount at which carried at close of period, Total 17,693      
Accumulated Depreciation and Amortization $ 5,387      
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 $ 65,946      
Initial cost to company, Land 64,499      
Initial cost to company, Buildings and Improvements 50,853      
Cost Capitalized Subsequent to Acquisition 9,076      
Gross amount at which carried at close of period, Land 64,499      
Gross amount at which carried at close of period, Buildings and Improvements 59,929      
Gross amount at which carried at close of period, Total 124,428      
Accumulated Depreciation and Amortization $ 9,406      
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 45,765      
Gross amount at which carried at close of period, Land 25,125      
Gross amount at which carried at close of period, Buildings and Improvements 55,994      
Gross amount at which carried at close of period, Total 81,119      
Accumulated Depreciation and Amortization $ 34,348      
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 4,399      
Gross amount at which carried at close of period, Land 7,280      
Gross amount at which carried at close of period, Buildings and Improvements 14,807      
Gross amount at which carried at close of period, Total 22,087      
Accumulated Depreciation and Amortization $ 9,328      
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 24,259      
Gross amount at which carried at close of period, Land 29,962      
Gross amount at which carried at close of period, Buildings and Improvements 67,627      
Gross amount at which carried at close of period, Total 97,589      
Accumulated Depreciation and Amortization $ 18,494      
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 1,800      
Gross amount at which carried at close of period, Land 1,470      
Gross amount at which carried at close of period, Buildings and Improvements 13,897      
Gross amount at which carried at close of period, Total 15,367      
Accumulated Depreciation and Amortization $ 5,482      
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 20,047      
Gross amount at which carried at close of period, Land 2,328      
Gross amount at which carried at close of period, Buildings and Improvements 20,047      
Gross amount at which carried at close of period, Total 22,375      
Accumulated Depreciation and Amortization $ 837      
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 30,974      
Gross amount at which carried at close of period, Land 5,865      
Gross amount at which carried at close of period, Buildings and Improvements 33,428      
Gross amount at which carried at close of period, Total 39,293      
Accumulated Depreciation and Amortization $ 22,105      
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 3,890      
Gross amount at which carried at close of period, Land 493      
Gross amount at which carried at close of period, Buildings and Improvements 4,238      
Gross amount at which carried at close of period, Total 4,731      
Accumulated Depreciation and Amortization $ 3,869      
Life on which depreciation in latest income statements is computed 17 years      
Village at Shirlington        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 6,704      
Initial cost to company, Land 9,761      
Initial cost to company, Buildings and Improvements 14,808      
Cost Capitalized Subsequent to Acquisition 41,784      
Gross amount at which carried at close of period, Land 4,234      
Gross amount at which carried at close of period, Buildings and Improvements 62,119      
Gross amount at which carried at close of period, Total 66,353      
Accumulated Depreciation and Amortization $ 29,320      
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 42,767      
Gross amount at which carried at close of period, Land 6,319      
Gross amount at which carried at close of period, Buildings and Improvements 150,051      
Gross amount at which carried at close of period, Total 156,370      
Accumulated Depreciation and Amortization $ 54,800      
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 835      
Gross amount at which carried at close of period, Land 3,478      
Gross amount at which carried at close of period, Buildings and Improvements 22,248      
Gross amount at which carried at close of period, Total 25,726      
Accumulated Depreciation and Amortization $ 9,106      
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 146      
Gross amount at which carried at close of period, Land 31,983      
Gross amount at which carried at close of period, Buildings and Improvements 1,959      
Gross amount at which carried at close of period, Total 33,942      
Accumulated Depreciation and Amortization $ 874      
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 14,197      
Gross amount at which carried at close of period, Land 9,111      
Gross amount at which carried at close of period, Buildings and Improvements 15,258      
Gross amount at which carried at close of period, Total 24,369      
Accumulated Depreciation and Amortization $ 8,727      
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 22,117      
Gross amount at which carried at close of period, Land 1,499      
Gross amount at which carried at close of period, Buildings and Improvements 28,760      
Gross amount at which carried at close of period, Total 30,259      
Accumulated Depreciation and Amortization $ 27,126      
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 92,318      
Gross amount at which carried at close of period, Land 7,790      
Gross amount at which carried at close of period, Buildings and Improvements 95,443      
Gross amount at which carried at close of period, Total 103,233      
Accumulated Depreciation and Amortization $ 60,517      
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 21,109      
Gross amount at which carried at close of period, Land 8,055      
Gross amount at which carried at close of period, Buildings and Improvements 34,868      
Gross amount at which carried at close of period, Total 42,923      
Accumulated Depreciation and Amortization $ 24,551      
Life on which depreciation in latest income statements is computed 35 years