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Schedule III - Summary of Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 545,679      
Initial cost to company, Land 1,449,865      
Initial cost to company, Buildings and Improvements 2,526,772      
Cost Capitalized Subsequent to Acquisition 4,321,495      
Gross amount at which carried at close of period, Land 1,414,814      
Gross amount at which carried at close of period, Buildings and Improvements 6,883,318      
Gross amount at which carried at close of period, Total 8,298,132 $ 7,819,472 $ 7,635,061 $ 6,759,073
Accumulated Depreciation and Amortization $ 2,215,413 $ 2,059,143 $ 1,876,544 $ 1,729,234
Maximum        
Real Estate and Accumulated Depreciation [Line Items]        
Life on which depreciation in latest income statements is computed 50 years      
29th Place        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 3,868      
Initial cost to company, Land 10,211      
Initial cost to company, Buildings and Improvements 18,863      
Cost Capitalized Subsequent to Acquisition 11,985      
Gross amount at which carried at close of period, Land 10,195      
Gross amount at which carried at close of period, Buildings and Improvements 30,864      
Gross amount at which carried at close of period, Total 41,059      
Accumulated Depreciation and Amortization 14,953      
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 11,718      
Gross amount at which carried at close of period, Land 2,432      
Gross amount at which carried at close of period, Buildings and Improvements 24,064      
Gross amount at which carried at close of period, Total 26,496      
Accumulated Depreciation and Amortization 20,382      
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 662,720      
Gross amount at which carried at close of period, Land 69,421      
Gross amount at which carried at close of period, Buildings and Improvements 720,747      
Gross amount at which carried at close of period, Total 790,168      
Accumulated Depreciation and Amortization 72,687      
Azalea        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 39,702      
Initial cost to company, Land 40,219      
Initial cost to company, Buildings and Improvements 67,117      
Cost Capitalized Subsequent to Acquisition (3)      
Gross amount at which carried at close of period, Land 40,219      
Gross amount at which carried at close of period, Buildings and Improvements 67,114      
Gross amount at which carried at close of period, Total 107,333      
Accumulated Depreciation and Amortization 6,109      
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 39,175      
Gross amount at which carried at close of period, Land 2,683      
Gross amount at which carried at close of period, Buildings and Improvements 54,523      
Gross amount at which carried at close of period, Total 57,206      
Accumulated Depreciation and Amortization 23,062      
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 6,515      
Gross amount at which carried at close of period, Land 12,617      
Gross amount at which carried at close of period, Buildings and Improvements 36,118      
Gross amount at which carried at close of period, Total 48,735      
Accumulated Depreciation and Amortization 4,513      
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 48,764      
Gross amount at which carried at close of period, Land 4,363      
Gross amount at which carried at close of period, Buildings and Improvements 65,223      
Gross amount at which carried at close of period, Total 69,586      
Accumulated Depreciation and Amortization 47,069      
Bell Gardens        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 12,292      
Initial cost to company, Land 24,406      
Initial cost to company, Buildings and Improvements 85,947      
Cost Capitalized Subsequent to Acquisition 589      
Gross amount at which carried at close of period, Land 24,406      
Gross amount at which carried at close of period, Buildings and Improvements 86,536      
Gross amount at which carried at close of period, Total 110,942      
Accumulated Depreciation and Amortization 10,215      
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 151,640      
Gross amount at which carried at close of period, Land 43,904      
Gross amount at which carried at close of period, Buildings and Improvements 189,721      
Gross amount at which carried at close of period, Total 233,625      
Accumulated Depreciation and Amortization 85,602      
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 72,050      
Gross amount at which carried at close of period, Land 4,094      
Gross amount at which carried at close of period, Buildings and Improvements 92,671      
Gross amount at which carried at close of period, Total 96,765      
Accumulated Depreciation and Amortization 52,749      
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 11,786      
Gross amount at which carried at close of period, Land 3,856      
Gross amount at which carried at close of period, Buildings and Improvements 27,745      
Gross amount at which carried at close of period, Total 31,601      
Accumulated Depreciation and Amortization 19,149      
Brook 35        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 11,304      
Initial cost to company, Land 7,128      
Initial cost to company, Buildings and Improvements 38,355      
Cost Capitalized Subsequent to Acquisition 2,792      
Gross amount at which carried at close of period, Land 7,128      
Gross amount at which carried at close of period, Buildings and Improvements 41,147      
Gross amount at which carried at close of period, Total 48,275      
Accumulated Depreciation and Amortization 8,360      
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 315      
Gross amount at which carried at close of period, Land 16,710      
Gross amount at which carried at close of period, Buildings and Improvements 13,727      
Gross amount at which carried at close of period, Total 30,437      
Accumulated Depreciation and Amortization 2,415      
Chelsea Commons        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 5,402      
Initial cost to company, Land 8,689      
Initial cost to company, Buildings and Improvements 19,466      
Cost Capitalized Subsequent to Acquisition 2,126      
Gross amount at which carried at close of period, Land 8,669      
Gross amount at which carried at close of period, Buildings and Improvements 21,612      
Gross amount at which carried at close of period, Total 30,281      
Accumulated Depreciation and Amortization 8,382      
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 47,158      
Gross amount at which carried at close of period, Land 34,406      
Gross amount at which carried at close of period, Buildings and Improvements 119,291      
Gross amount at which carried at close of period, Total 153,697      
Accumulated Depreciation and Amortization 10,175      
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 10,375      
Gross amount at which carried at close of period, Land 5,262      
Gross amount at which carried at close of period, Buildings and Improvements 14,446      
Gross amount at which carried at close of period, Total 19,708      
Accumulated Depreciation and Amortization 11,507      
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 95,064      
Gross amount at which carried at close of period, Land 2,793      
Gross amount at which carried at close of period, Buildings and Improvements 102,488      
Gross amount at which carried at close of period, Total 105,281      
Accumulated Depreciation and Amortization 58,521      
Courthouse Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 1,750      
Initial cost to company, Buildings and Improvements 1,869      
Cost Capitalized Subsequent to Acquisition 3,106      
Gross amount at which carried at close of period, Land 1,750      
Gross amount at which carried at close of period, Buildings and Improvements 4,975      
Gross amount at which carried at close of period, Total 6,725      
Accumulated Depreciation and Amortization 2,408      
Crossroads        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 4,635      
Initial cost to company, Buildings and Improvements 11,611      
Cost Capitalized Subsequent to Acquisition 19,462      
Gross amount at which carried at close of period, Land 4,635      
Gross amount at which carried at close of period, Buildings and Improvements 31,073      
Gross amount at which carried at close of period, Total 35,708      
Accumulated Depreciation and Amortization 18,708      
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 8,392      
Gross amount at which carried at close of period, Land 27,245      
Gross amount at which carried at close of period, Buildings and Improvements 62,967      
Gross amount at which carried at close of period, Total 90,212      
Accumulated Depreciation and Amortization 25,878      
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 7,214      
Gross amount at which carried at close of period, Land 30,368      
Gross amount at which carried at close of period, Buildings and Improvements 26,737      
Gross amount at which carried at close of period, Total 57,105      
Accumulated Depreciation and Amortization 4,351      
Dedham Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 16,658      
Initial cost to company, Buildings and Improvements 13,964      
Cost Capitalized Subsequent to Acquisition 15,825      
Gross amount at which carried at close of period, Land 16,658      
Gross amount at which carried at close of period, Buildings and Improvements 29,789      
Gross amount at which carried at close of period, Total 46,447      
Accumulated Depreciation and Amortization 17,108      
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 15,821      
Gross amount at which carried at close of period, Land 15,587      
Gross amount at which carried at close of period, Buildings and Improvements 57,570      
Gross amount at which carried at close of period, Total 73,157      
Accumulated Depreciation and Amortization 24,154      
East Bay Bridge        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 29,069      
Initial cost to company, Buildings and Improvements 138,035      
Cost Capitalized Subsequent to Acquisition 11,839      
Gross amount at which carried at close of period, Land 29,069      
Gross amount at which carried at close of period, Buildings and Improvements 149,874      
Gross amount at which carried at close of period, Total 178,943      
Accumulated Depreciation and Amortization 36,029      
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 27,806      
Gross amount at which carried at close of period, Land 1,608      
Gross amount at which carried at close of period, Buildings and Improvements 33,581      
Gross amount at which carried at close of period, Total 35,189      
Accumulated Depreciation and Amortization 21,822      
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 19,277      
Gross amount at which carried at close of period, Land 4,013      
Gross amount at which carried at close of period, Buildings and Improvements 30,601      
Gross amount at which carried at close of period, Total 34,614      
Accumulated Depreciation and Amortization 21,832      
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 17,942      
Gross amount at which carried at close of period, Land 19,117      
Gross amount at which carried at close of period, Buildings and Improvements 33,771      
Gross amount at which carried at close of period, Total 52,888      
Accumulated Depreciation and Amortization 19,105      
Fairfax Junction        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 10,229      
Initial cost to company, Buildings and Improvements 11,321      
Cost Capitalized Subsequent to Acquisition 25      
Gross amount at which carried at close of period, Land 10,229      
Gross amount at which carried at close of period, Buildings and Improvements 11,346      
Gross amount at which carried at close of period, Total 21,575      
Accumulated Depreciation and Amortization 548      
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 11,370      
Gross amount at which carried at close of period, Land 1,819      
Gross amount at which carried at close of period, Buildings and Improvements 12,619      
Gross amount at which carried at close of period, Total 14,438      
Accumulated Depreciation and Amortization 9,078      
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 42,396      
Gross amount at which carried at close of period, Land 10,216      
Gross amount at which carried at close of period, Buildings and Improvements 60,291      
Gross amount at which carried at close of period, Total 70,507      
Accumulated Depreciation and Amortization 46,693      
Finley Square        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 9,252      
Initial cost to company, Buildings and Improvements 9,544      
Cost Capitalized Subsequent to Acquisition 22,645      
Gross amount at which carried at close of period, Land 9,252      
Gross amount at which carried at close of period, Buildings and Improvements 32,189      
Gross amount at which carried at close of period, Total 41,441      
Accumulated Depreciation and Amortization 22,071      
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 11,795      
Gross amount at which carried at close of period, Land 1,507      
Gross amount at which carried at close of period, Buildings and Improvements 15,576      
Gross amount at which carried at close of period, Total 17,083      
Accumulated Depreciation and Amortization 7,028      
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 2,345      
Gross amount at which carried at close of period, Land 13,978      
Gross amount at which carried at close of period, Buildings and Improvements 12,254      
Gross amount at which carried at close of period, Total 26,232      
Accumulated Depreciation and Amortization 1,014      
Freedom Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 3,255      
Cost Capitalized Subsequent to Acquisition 35,623      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 38,878      
Gross amount at which carried at close of period, Total 38,878      
Accumulated Depreciation and Amortization 0      
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 43,297      
Gross amount at which carried at close of period, Land 24,633      
Gross amount at which carried at close of period, Buildings and Improvements 68,544      
Gross amount at which carried at close of period, Total 93,177      
Accumulated Depreciation and Amortization 43,607      
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 4,662      
Gross amount at which carried at close of period, Land 12,696      
Gross amount at which carried at close of period, Buildings and Improvements 25,465      
Gross amount at which carried at close of period, Total 38,161      
Accumulated Depreciation and Amortization 13,970      
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 15,692      
Gross amount at which carried at close of period, Land 5,973      
Gross amount at which carried at close of period, Buildings and Improvements 22,691      
Gross amount at which carried at close of period, Total 28,664      
Accumulated Depreciation and Amortization 18,933      
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 7,295      
Gross amount at which carried at close of period, Land 2,677      
Gross amount at which carried at close of period, Buildings and Improvements 12,124      
Gross amount at which carried at close of period, Total 14,801      
Accumulated Depreciation and Amortization 8,640      
Georgetowne Shopping Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 30,738      
Initial cost to company, Buildings and Improvements 50,103      
Cost Capitalized Subsequent to Acquisition 946      
Gross amount at which carried at close of period, Land 32,199      
Gross amount at which carried at close of period, Buildings and Improvements 49,588      
Gross amount at which carried at close of period, Total 81,787      
Accumulated Depreciation and Amortization 295      
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 20,620      
Gross amount at which carried at close of period, Land 2,068      
Gross amount at which carried at close of period, Buildings and Improvements 25,525      
Gross amount at which carried at close of period, Total 27,593      
Accumulated Depreciation and Amortization 22,092      
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 20,518      
Gross amount at which carried at close of period, Land 1,169      
Gross amount at which carried at close of period, Buildings and Improvements 35,682      
Gross amount at which carried at close of period, Total 36,851      
Accumulated Depreciation and Amortization 28,526      
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 17,996      
Gross amount at which carried at close of period, Land 525      
Gross amount at which carried at close of period, Buildings and Improvements 19,597      
Gross amount at which carried at close of period, Total 20,122      
Accumulated Depreciation and Amortization 18,005      
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 412      
Gross amount at which carried at close of period, Land 10,590      
Gross amount at which carried at close of period, Buildings and Improvements 21,281      
Gross amount at which carried at close of period, Total 31,871      
Accumulated Depreciation and Amortization 3,468      
Greenwich Avenue        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 7,484      
Initial cost to company, Buildings and Improvements 5,445      
Cost Capitalized Subsequent to Acquisition 10,819      
Gross amount at which carried at close of period, Land 7,484      
Gross amount at which carried at close of period, Buildings and Improvements 16,264      
Gross amount at which carried at close of period, Total 23,748      
Accumulated Depreciation and Amortization 4,824      
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 438      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 22,831      
Gross amount at which carried at close of period, Total 22,831      
Accumulated Depreciation and Amortization 2,272      
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 5,388      
Gross amount at which carried at close of period, Land 8,419      
Gross amount at which carried at close of period, Buildings and Improvements 21,022      
Gross amount at which carried at close of period, Total 29,441      
Accumulated Depreciation and Amortization 13,170      
Hoboken        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 98,224      
Initial cost to company, Land 45,385      
Initial cost to company, Buildings and Improvements 150,905      
Cost Capitalized Subsequent to Acquisition 952      
Gross amount at which carried at close of period, Land 43,450      
Gross amount at which carried at close of period, Buildings and Improvements 153,792      
Gross amount at which carried at close of period, Total 197,242      
Accumulated Depreciation and Amortization 628      
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 26,745      
Gross amount at which carried at close of period, Land 8,370      
Gross amount at which carried at close of period, Buildings and Improvements 43,595      
Gross amount at which carried at close of period, Total 51,965      
Accumulated Depreciation and Amortization 16,783      
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 18,484      
Gross amount at which carried at close of period, Land 12,194      
Gross amount at which carried at close of period, Buildings and Improvements 34,492      
Gross amount at which carried at close of period, Total 46,686      
Accumulated Depreciation and Amortization 17,431      
Huntington Square        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 10,075      
Cost Capitalized Subsequent to Acquisition 3,148      
Gross amount at which carried at close of period, Land 506      
Gross amount at which carried at close of period, Buildings and Improvements 12,717      
Gross amount at which carried at close of period, Total 13,223      
Accumulated Depreciation and Amortization 4,238      
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 2,779      
Gross amount at which carried at close of period, Land 4,308      
Gross amount at which carried at close of period, Buildings and Improvements 12,805      
Gross amount at which carried at close of period, Total 17,113      
Accumulated Depreciation and Amortization 9,716      
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 866      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 11,580      
Gross amount at which carried at close of period, Total 11,580      
Accumulated Depreciation and Amortization 9,545      
Lancaster        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 2,103      
Cost Capitalized Subsequent to Acquisition 6,116      
Gross amount at which carried at close of period, Land 432      
Gross amount at which carried at close of period, Buildings and Improvements 7,787      
Gross amount at which carried at close of period, Total 8,219      
Accumulated Depreciation and Amortization 6,008      
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 18,992      
Gross amount at which carried at close of period, Land 720      
Gross amount at which carried at close of period, Buildings and Improvements 21,966      
Gross amount at which carried at close of period, Total 22,686      
Accumulated Depreciation and Amortization 16,661      
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 28,273      
Gross amount at which carried at close of period, Land 7,462      
Gross amount at which carried at close of period, Buildings and Improvements 50,794      
Gross amount at which carried at close of period, Total 58,256      
Accumulated Depreciation and Amortization 40,417      
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 19,621      
Gross amount at which carried at close of period, Land 6,161      
Gross amount at which carried at close of period, Buildings and Improvements 28,101      
Gross amount at which carried at close of period, Total 34,262      
Accumulated Depreciation and Amortization 23,385      
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 18,165      
Gross amount at which carried at close of period, Land 8,184      
Gross amount at which carried at close of period, Buildings and Improvements 28,887      
Gross amount at which carried at close of period, Total 37,071      
Accumulated Depreciation and Amortization 16,067      
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 51,735      
Gross amount at which carried at close of period, Land 79,346      
Gross amount at which carried at close of period, Buildings and Improvements 71,018      
Gross amount at which carried at close of period, Total 150,364      
Accumulated Depreciation and Amortization 26,947      
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 31,450      
Gross amount at which carried at close of period, Land 35,622      
Gross amount at which carried at close of period, Buildings and Improvements 64,332      
Gross amount at which carried at close of period, Total 99,954      
Accumulated Depreciation and Amortization 17,028      
Mercer Mall        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 5,917      
Initial cost to company, Buildings and Improvements 18,358      
Cost Capitalized Subsequent to Acquisition 48,524      
Gross amount at which carried at close of period, Land 5,917      
Gross amount at which carried at close of period, Buildings and Improvements 66,882      
Gross amount at which carried at close of period, Total 72,799      
Accumulated Depreciation and Amortization 33,340      
Montrose Crossing        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 67,492      
Initial cost to company, Land 48,624      
Initial cost to company, Buildings and Improvements 91,819      
Cost Capitalized Subsequent to Acquisition 22,110      
Gross amount at which carried at close of period, Land 48,624      
Gross amount at which carried at close of period, Buildings and Improvements 113,929      
Gross amount at which carried at close of period, Total 162,553      
Accumulated Depreciation and Amortization 32,948      
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 42,942      
Gross amount at which carried at close of period, Land 10,150      
Gross amount at which carried at close of period, Buildings and Improvements 76,361      
Gross amount at which carried at close of period, Total 86,511      
Accumulated Depreciation and Amortization 39,734      
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      
Northeast        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 938      
Initial cost to company, Buildings and Improvements 8,779      
Cost Capitalized Subsequent to Acquisition 22,027      
Gross amount at which carried at close of period, Land 939      
Gross amount at which carried at close of period, Buildings and Improvements 30,805      
Gross amount at which carried at close of period, Total 31,744      
Accumulated Depreciation and Amortization 19,120      
Old Keene Mill        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 638      
Initial cost to company, Buildings and Improvements 998      
Cost Capitalized Subsequent to Acquisition 11,093      
Gross amount at which carried at close of period, Land 638      
Gross amount at which carried at close of period, Buildings and Improvements 12,091      
Gross amount at which carried at close of period, Total 12,729      
Accumulated Depreciation and Amortization 6,017      
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 29,348      
Gross amount at which carried at close of period, Land 3,420      
Gross amount at which carried at close of period, Buildings and Improvements 32,113      
Gross amount at which carried at close of period, Total 35,533      
Accumulated Depreciation and Amortization 22,722      
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 17,869      
Gross amount at which carried at close of period, Land 15,048      
Gross amount at which carried at close of period, Buildings and Improvements 64,601      
Gross amount at which carried at close of period, Total 79,649      
Accumulated Depreciation and Amortization 3,016      
Pan Am Shopping Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 8,694      
Initial cost to company, Buildings and Improvements 12,929      
Cost Capitalized Subsequent to Acquisition 8,314      
Gross amount at which carried at close of period, Land 8,695      
Gross amount at which carried at close of period, Buildings and Improvements 21,242      
Gross amount at which carried at close of period, Total 29,937      
Accumulated Depreciation and Amortization 16,292      
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 103,383      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 106,338      
Gross amount at which carried at close of period, Total 106,338      
Accumulated Depreciation and Amortization 52,509      
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 22,943      
Gross amount at which carried at close of period, Land 2,800      
Gross amount at which carried at close of period, Buildings and Improvements 29,404      
Gross amount at which carried at close of period, Total 32,204      
Accumulated Depreciation and Amortization 24,834      
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 579,682      
Gross amount at which carried at close of period, Land 27,929      
Gross amount at which carried at close of period, Buildings and Improvements 593,559      
Gross amount at which carried at close of period, Total 621,488      
Accumulated Depreciation and Amortization 50,600      
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 11,569      
Gross amount at which carried at close of period, Land 14,914      
Gross amount at which carried at close of period, Buildings and Improvements 34,424      
Gross amount at which carried at close of period, Total 49,338      
Accumulated Depreciation and Amortization 18,736      
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 14,859      
Gross amount at which carried at close of period, Land 10,305      
Gross amount at which carried at close of period, Buildings and Improvements 36,412      
Gross amount at which carried at close of period, Total 46,717      
Accumulated Depreciation and Amortization 5,571      
Plaza Del Sol        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 8,308      
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 1,185      
Plaza El Segundo/The Point        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 124,336      
Initial cost to company, Land 62,127      
Initial cost to company, Buildings and Improvements 153,556      
Cost Capitalized Subsequent to Acquisition 77,079      
Gross amount at which carried at close of period, Land 64,788      
Gross amount at which carried at close of period, Buildings and Improvements 227,974      
Gross amount at which carried at close of period, Total 292,762      
Accumulated Depreciation and Amortization 54,745      
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 6,166      
Gross amount at which carried at close of period, Land 3,319      
Gross amount at which carried at close of period, Buildings and Improvements 14,623      
Gross amount at which carried at close of period, Total 17,942      
Accumulated Depreciation and Amortization 10,580      
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 30,386      
Gross amount at which carried at close of period, Land 2,928      
Gross amount at which carried at close of period, Buildings and Improvements 38,604      
Gross amount at which carried at close of period, Total 41,532      
Accumulated Depreciation and Amortization 22,770      
Riverpoint Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 15,422      
Initial cost to company, Buildings and Improvements 104,572      
Cost Capitalized Subsequent to Acquisition 1,930      
Gross amount at which carried at close of period, Land 15,422      
Gross amount at which carried at close of period, Buildings and Improvements 106,502      
Gross amount at which carried at close of period, Total 121,924      
Accumulated Depreciation and Amortization 9,487      
Rockville Town Square        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 0      
Initial cost to company, Buildings and Improvements 8,092      
Cost Capitalized Subsequent to Acquisition 39,639      
Gross amount at which carried at close of period, Land 0      
Gross amount at which carried at close of period, Buildings and Improvements 47,731      
Gross amount at which carried at close of period, Total 47,731      
Accumulated Depreciation and Amortization 20,001      
Rollingwood Apts.        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 552      
Initial cost to company, Buildings and Improvements 2,246      
Cost Capitalized Subsequent to Acquisition 8,575      
Gross amount at which carried at close of period, Land 774      
Gross amount at which carried at close of period, Buildings and Improvements 10,599      
Gross amount at which carried at close of period, Total 11,373      
Accumulated Depreciation and Amortization 9,940      
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 3,022      
Gross amount at which carried at close of period, Land 4,840      
Gross amount at which carried at close of period, Buildings and Improvements 9,341      
Gross amount at which carried at close of period, Total 14,181      
Accumulated Depreciation and Amortization 5,912      
San Antonio Center        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 26,400      
Initial cost to company, Buildings and Improvements 18,462      
Cost Capitalized Subsequent to Acquisition 1,141      
Gross amount at which carried at close of period, Land 26,400      
Gross amount at which carried at close of period, Buildings and Improvements 19,603      
Gross amount at which carried at close of period, Total 46,003      
Accumulated Depreciation and Amortization 3,752      
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 976,080      
Gross amount at which carried at close of period, Land 53,217      
Gross amount at which carried at close of period, Buildings and Improvements 997,047      
Gross amount at which carried at close of period, Total 1,050,264      
Accumulated Depreciation and Amortization 221,350      
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 4,501      
Gross amount at which carried at close of period, Land 4,383      
Gross amount at which carried at close of period, Buildings and Improvements 12,792      
Gross amount at which carried at close of period, Total 17,175      
Accumulated Depreciation and Amortization 7,557      
Sylmar Towne Center        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 16,854      
Initial cost to company, Land 18,522      
Initial cost to company, Buildings and Improvements 24,636      
Cost Capitalized Subsequent to Acquisition 679      
Gross amount at which carried at close of period, Land 18,522      
Gross amount at which carried at close of period, Buildings and Improvements 25,315      
Gross amount at which carried at close of period, Total 43,837      
Accumulated Depreciation and Amortization 2,205      
The Avenue at White Marsh        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 52,597      
Initial cost to company, Land 20,682      
Initial cost to company, Buildings and Improvements 72,432      
Cost Capitalized Subsequent to Acquisition 29,311      
Gross amount at which carried at close of period, Land 20,685      
Gross amount at which carried at close of period, Buildings and Improvements 101,740      
Gross amount at which carried at close of period, Total 122,425      
Accumulated Depreciation and Amortization 38,923      
The Grove at Shrewsbury        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 42,874      
Initial cost to company, Land 18,016      
Initial cost to company, Buildings and Improvements 103,115      
Cost Capitalized Subsequent to Acquisition 5,419      
Gross amount at which carried at close of period, Land 18,021      
Gross amount at which carried at close of period, Buildings and Improvements 108,529      
Gross amount at which carried at close of period, Total 126,550      
Accumulated Depreciation and Amortization 20,825      
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 735      
Gross amount at which carried at close of period, Land 4,441      
Gross amount at which carried at close of period, Buildings and Improvements 13,584      
Gross amount at which carried at close of period, Total 18,025      
Accumulated Depreciation and Amortization 5,889      
The Shops at Sunset Place        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 62,426      
Initial cost to company, Land 64,499      
Initial cost to company, Buildings and Improvements 50,853      
Cost Capitalized Subsequent to Acquisition 8,944      
Gross amount at which carried at close of period, Land 64,499      
Gross amount at which carried at close of period, Buildings and Improvements 59,797      
Gross amount at which carried at close of period, Total 124,296      
Accumulated Depreciation and Amortization 10,136      
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 45,863      
Gross amount at which carried at close of period, Land 25,125      
Gross amount at which carried at close of period, Buildings and Improvements 56,092      
Gross amount at which carried at close of period, Total 81,217      
Accumulated Depreciation and Amortization 36,201      
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 4,797      
Gross amount at which carried at close of period, Land 7,280      
Gross amount at which carried at close of period, Buildings and Improvements 15,205      
Gross amount at which carried at close of period, Total 22,485      
Accumulated Depreciation and Amortization 9,921      
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 24,855      
Gross amount at which carried at close of period, Land 29,962      
Gross amount at which carried at close of period, Buildings and Improvements 68,223      
Gross amount at which carried at close of period, Total 98,185      
Accumulated Depreciation and Amortization 21,085      
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 2,888      
Gross amount at which carried at close of period, Land 1,535      
Gross amount at which carried at close of period, Buildings and Improvements 14,920      
Gross amount at which carried at close of period, Total 16,455      
Accumulated Depreciation and Amortization 5,931      
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 20,042      
Gross amount at which carried at close of period, Land 2,328      
Gross amount at which carried at close of period, Buildings and Improvements 20,042      
Gross amount at which carried at close of period, Total 22,370      
Accumulated Depreciation and Amortization 1,454      
Troy        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 3,126      
Initial cost to company, Buildings and Improvements 5,193      
Cost Capitalized Subsequent to Acquisition 32,655      
Gross amount at which carried at close of period, Land 5,865      
Gross amount at which carried at close of period, Buildings and Improvements 35,109      
Gross amount at which carried at close of period, Total 40,974      
Accumulated Depreciation and Amortization 23,135      
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 4,170      
Gross amount at which carried at close of period, Land 493      
Gross amount at which carried at close of period, Buildings and Improvements 4,518      
Gross amount at which carried at close of period, Total 5,011      
Accumulated Depreciation and Amortization 3,939      
Village at Shirlington        
Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances      
Initial cost to company, Land 9,761      
Initial cost to company, Buildings and Improvements 14,808      
Cost Capitalized Subsequent to Acquisition 38,771      
Gross amount at which carried at close of period, Land 4,234      
Gross amount at which carried at close of period, Buildings and Improvements 59,106      
Gross amount at which carried at close of period, Total 63,340      
Accumulated Depreciation and Amortization 30,187      
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 43,870      
Gross amount at which carried at close of period, Land 6,319      
Gross amount at which carried at close of period, Buildings and Improvements 151,154      
Gross amount at which carried at close of period, Total 157,473      
Accumulated Depreciation and Amortization 61,106      
White Marsh Plaza        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 3,478      
Initial cost to company, Buildings and Improvements 21,413      
Cost Capitalized Subsequent to Acquisition 1,028      
Gross amount at which carried at close of period, Land 3,478      
Gross amount at which carried at close of period, Buildings and Improvements 22,441      
Gross amount at which carried at close of period, Total 25,919      
Accumulated Depreciation and Amortization 9,736      
White Marsh Other        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost to company, Land 29,725      
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 29,754      
Gross amount at which carried at close of period, Buildings and Improvements 1,960      
Gross amount at which carried at close of period, Total 31,714      
Accumulated Depreciation and Amortization 913      
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 15,905      
Gross amount at which carried at close of period, Land 9,111      
Gross amount at which carried at close of period, Buildings and Improvements 16,966      
Gross amount at which carried at close of period, Total 26,077      
Accumulated Depreciation and Amortization 9,208      
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 22,061      
Gross amount at which carried at close of period, Land 1,499      
Gross amount at which carried at close of period, Buildings and Improvements 28,704      
Gross amount at which carried at close of period, Total 30,203      
Accumulated Depreciation and Amortization 27,812      
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 91,838      
Gross amount at which carried at close of period, Land 7,790      
Gross amount at which carried at close of period, Buildings and Improvements 94,963      
Gross amount at which carried at close of period, Total 102,753      
Accumulated Depreciation and Amortization 62,087      
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 21,272      
Gross amount at which carried at close of period, Land 8,055      
Gross amount at which carried at close of period, Buildings and Improvements 35,031      
Gross amount at which carried at close of period, Total 43,086      
Accumulated Depreciation and Amortization $ 25,668