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Schedule III - Real Estate and Accumulated Depreciation - Real Estate Property (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances $ 1,562,159      
Initial cost to company        
Land 508,849      
Building and improvements 1,385,212      
Costs capitalized subsequent to acquisition 874,931      
Gross amount at which carried at close of period        
Land 525,819      
Building and improvements 2,243,173      
Total 2,768,992 $ 2,671,854 $ 2,138,500 $ 2,084,642
Accumulated depreciation and amortization (645,872) (587,127) $ (541,077) $ (509,112)
Aggregate cost for federal income tax purposes 1,500,000      
Real Estate        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 1,562,159      
Initial cost to company        
Land 508,849      
Building and improvements 1,385,212      
Costs capitalized subsequent to acquisition 868,256      
Gross amount at which carried at close of period        
Land 525,819      
Building and improvements 2,236,498      
Total 2,762,317      
Real Estate | Bethlehem, PA        
Gross amount at which carried at close of period        
Accumulated depreciation and amortization (644,367)      
Real Estate | Shopping Centers and Malls | Baltimore (Towson), MD        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial cost to company        
Land 581      
Building and improvements 3,227      
Costs capitalized subsequent to acquisition 18,603      
Gross amount at which carried at close of period        
Land 581      
Building and improvements 21,830      
Total 22,411      
Accumulated depreciation and amortization (6,356)      
Real Estate | Shopping Centers and Malls | Bensalem, PA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial cost to company        
Land 2,727      
Building and improvements 6,698      
Costs capitalized subsequent to acquisition 2,042      
Gross amount at which carried at close of period        
Land 2,727      
Building and improvements 8,740      
Total 11,467      
Accumulated depreciation and amortization (4,509)      
Real Estate | Shopping Centers and Malls | Bergen Town Center - East, Paramus, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   6,305    
Building and improvements   0    
Costs capitalized subsequent to acquisition   42,336    
Gross amount at which carried at close of period        
Land   6,305    
Building and improvements   42,336    
Total   48,641    
Accumulated depreciation and amortization   (8,768)    
Real Estate | Shopping Centers and Malls | Bergen Town Center - West, Paramus, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   300,000    
Initial cost to company        
Land   15,812    
Building and improvements   82,240    
Costs capitalized subsequent to acquisition   385,142    
Gross amount at which carried at close of period        
Land   35,850    
Building and improvements   447,344    
Total   483,194    
Accumulated depreciation and amortization   (121,024)    
Real Estate | Shopping Centers and Malls | Bethlehem, PA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   827    
Building and improvements   5,200    
Costs capitalized subsequent to acquisition   1,915    
Gross amount at which carried at close of period        
Land   837    
Building and improvements   7,105    
Total   7,942    
Accumulated depreciation and amortization   (5,870)    
Real Estate | Shopping Centers and Malls | Brick, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   50,000    
Initial cost to company        
Land   1,391    
Building and improvements   11,179    
Costs capitalized subsequent to acquisition   13,342    
Gross amount at which carried at close of period        
Land   1,391    
Building and improvements   24,521    
Total   25,912    
Accumulated depreciation and amortization   (15,492)    
Real Estate | Shopping Centers and Malls | Bronx (Shops at Bruckner), NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   66,100    
Building and improvements   259,503    
Costs capitalized subsequent to acquisition   591    
Gross amount at which carried at close of period        
Land   61,618    
Building and improvements   264,576    
Total   326,194    
Accumulated depreciation and amortization   (24,862)    
Real Estate | Shopping Centers and Malls | Bronx (Shops at Bruckner), NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   11,582    
Initial cost to company        
Land   0    
Building and improvements   32,979    
Costs capitalized subsequent to acquisition   38    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   33,017    
Total   33,017    
Accumulated depreciation and amortization   (2,154)    
Real Estate | Shopping Centers and Malls | Bronx (1750-1780 Gun Hill Road), NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   24,500    
Initial cost to company        
Land   6,427    
Building and improvements   11,885    
Costs capitalized subsequent to acquisition   22,237    
Gross amount at which carried at close of period        
Land   6,428    
Building and improvements   34,121    
Total   40,549    
Accumulated depreciation and amortization   (9,502)    
Real Estate | Shopping Centers and Malls | Broomall, PA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   850    
Building and improvements   2,171    
Costs capitalized subsequent to acquisition   1,399    
Gross amount at which carried at close of period        
Land   850    
Building and improvements   3,570    
Total   4,420    
Accumulated depreciation and amortization   (2,946)    
Real Estate | Shopping Centers and Malls | Buffalo (Amherst), NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   5,743    
Building and improvements   4,056    
Costs capitalized subsequent to acquisition   12,446    
Gross amount at which carried at close of period        
Land   5,107    
Building and improvements   17,138    
Total   22,245    
Accumulated depreciation and amortization   (8,916)    
Real Estate | Shopping Centers and Malls | Cambridge (leased through 2033, MA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   0    
Costs capitalized subsequent to acquisition   97    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   97    
Total   97    
Accumulated depreciation and amortization   (5)    
Real Estate | Shopping Centers and Malls | Carlstadt (leased through 2050), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   16,458    
Costs capitalized subsequent to acquisition   133    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   16,591    
Total   16,591    
Accumulated depreciation and amortization   (4,627)    
Real Estate | Shopping Centers and Malls | Charleston (leased through 2063), SC        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   3,634    
Costs capitalized subsequent to acquisition   308    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   3,942    
Total   3,942    
Accumulated depreciation and amortization   (1,123)    
Real Estate | Shopping Centers and Malls | Cherry Hill (Cherry Hill Commons), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   5,864    
Building and improvements   2,694    
Costs capitalized subsequent to acquisition   1,850    
Gross amount at which carried at close of period        
Land   4,144    
Building and improvements   6,264    
Total   10,408    
Accumulated depreciation and amortization   (3,970)    
Real Estate | Shopping Centers and Malls | Cherry Hill (Plaza at Cherry Hill), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   28,930    
Initial cost to company        
Land   14,602    
Building and improvements   33,666    
Costs capitalized subsequent to acquisition   (125)    
Gross amount at which carried at close of period        
Land   14,602    
Building and improvements   33,541    
Total   48,143    
Accumulated depreciation and amortization   (3,129)    
Real Estate | Shopping Centers and Malls | Chicopee, MA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   895    
Building and improvements   0    
Costs capitalized subsequent to acquisition   0    
Gross amount at which carried at close of period        
Land   895    
Building and improvements   0    
Total   895    
Accumulated depreciation and amortization   0    
Real Estate | Shopping Centers and Malls | Commack (leased through 2021), NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   43    
Costs capitalized subsequent to acquisition   184    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   227    
Total   227    
Accumulated depreciation and amortization   (243)    
Real Estate | Shopping Centers and Malls | Dewitt (leased through 2041), NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   7,116    
Costs capitalized subsequent to acquisition   0    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   7,116    
Total   7,116    
Accumulated depreciation and amortization   (2,158)    
Real Estate | Shopping Centers and Malls | Rockaway, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   27,800    
Initial cost to company        
Land   559    
Building and improvements   6,363    
Costs capitalized subsequent to acquisition   5,403    
Gross amount at which carried at close of period        
Land   559    
Building and improvements   11,766    
Total   12,325    
Accumulated depreciation and amortization   (6,581)    
Real Estate | Shopping Centers and Malls | East Brunswick, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   63,000    
Initial cost to company        
Land   2,417    
Building and improvements   17,169    
Costs capitalized subsequent to acquisition   7,512    
Gross amount at which carried at close of period        
Land   2,417    
Building and improvements   24,681    
Total   27,098    
Accumulated depreciation and amortization   (18,152)    
Real Estate | Shopping Centers and Malls | East Hanover (200 - 240 Route 10 West), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   63,000    
Initial cost to company        
Land   2,232    
Building and improvements   18,241    
Costs capitalized subsequent to acquisition   19,349    
Gross amount at which carried at close of period        
Land   2,671    
Building and improvements   37,151    
Total   39,822    
Accumulated depreciation and amortization   (18,719)    
Real Estate | Shopping Centers and Malls | East Hanover (280 Route 10 West), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   0    
Costs capitalized subsequent to acquisition   7,075    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   7,075    
Total   7,075    
Accumulated depreciation and amortization   (2,543)    
Real Estate | Shopping Centers and Malls | East Rutherford, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   23,000    
Initial cost to company        
Land   0    
Building and improvements   36,727    
Costs capitalized subsequent to acquisition   542    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   37,269    
Total   37,269    
Accumulated depreciation and amortization   (8,109)    
Real Estate | Shopping Centers and Malls | Freeport (240 West Sunrise Highway) (leased through 2040), NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   0    
Costs capitalized subsequent to acquisition   260    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   260    
Total   260    
Accumulated depreciation and amortization   (240)    
Real Estate | Shopping Centers and Malls | Freeport (437 East Sunrise Highway), NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   43,100    
Initial cost to company        
Land   1,231    
Building and improvements   4,747    
Costs capitalized subsequent to acquisition   4,765    
Gross amount at which carried at close of period        
Land   1,382    
Building and improvements   9,361    
Total   10,743    
Accumulated depreciation and amortization   (6,558)    
Real Estate | Shopping Centers and Malls | Garfield, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   40,300    
Initial cost to company        
Land   45    
Building and improvements   8,068    
Costs capitalized subsequent to acquisition   45,110    
Gross amount at which carried at close of period        
Land   44    
Building and improvements   53,179    
Total   53,223    
Accumulated depreciation and amortization   (14,338)    
Real Estate | Shopping Centers and Malls | Glen Burnie, MD        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   462    
Building and improvements   2,571    
Costs capitalized subsequent to acquisition   3,950    
Gross amount at which carried at close of period        
Land   462    
Building and improvements   6,521    
Total   6,983    
Accumulated depreciation and amortization   (3,504)    
Real Estate | Shopping Centers and Malls | Glenolden, PA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   850    
Building and improvements   1,820    
Costs capitalized subsequent to acquisition   741    
Gross amount at which carried at close of period        
Land   850    
Building and improvements   2,561    
Total   3,411    
Accumulated depreciation and amortization   (2,295)    
Real Estate | Shopping Centers and Malls | Hackensack, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   66,400    
Initial cost to company        
Land   692    
Building and improvements   10,219    
Costs capitalized subsequent to acquisition   7,145    
Gross amount at which carried at close of period        
Land   692    
Building and improvements   17,364    
Total   18,056    
Accumulated depreciation and amortization   (10,415)    
Real Estate | Shopping Centers and Malls | Hazlet, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   7,400    
Building and improvements   9,413    
Costs capitalized subsequent to acquisition   (2,135)    
Gross amount at which carried at close of period        
Land   7,400    
Building and improvements   7,278    
Total   14,678    
Accumulated depreciation and amortization   (2,098)    
Real Estate | Shopping Centers and Malls | Huntington, NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   21,200    
Building and improvements   33,667    
Costs capitalized subsequent to acquisition   6,385    
Gross amount at which carried at close of period        
Land   21,200    
Building and improvements   40,052    
Total   61,252    
Accumulated depreciation and amortization   (10,313)    
Real Estate | Shopping Centers and Malls | Inwood, NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   12,419    
Building and improvements   19,097    
Costs capitalized subsequent to acquisition   3,115    
Gross amount at which carried at close of period        
Land   12,419    
Building and improvements   22,212    
Total   34,631    
Accumulated depreciation and amortization   (7,755)    
Real Estate | Shopping Centers and Malls | Jersey City (Hudson Commons), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   29,000    
Initial cost to company        
Land   652    
Building and improvements   7,495    
Costs capitalized subsequent to acquisition   950    
Gross amount at which carried at close of period        
Land   652    
Building and improvements   8,445    
Total   9,097    
Accumulated depreciation and amortization   (3,584)    
Real Estate | Shopping Centers and Malls | Jersey City (Hudson Mall), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   24,326    
Initial cost to company        
Land   15,824    
Building and improvements   37,593    
Costs capitalized subsequent to acquisition   (3,922)    
Gross amount at which carried at close of period        
Land   15,824    
Building and improvements   33,671    
Total   49,495    
Accumulated depreciation and amortization   (3,215)    
Real Estate | Shopping Centers and Malls | Kearny, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   309    
Building and improvements   3,376    
Costs capitalized subsequent to acquisition   10,315    
Gross amount at which carried at close of period        
Land   296    
Building and improvements   13,704    
Total   14,000    
Accumulated depreciation and amortization   (4,855)    
Real Estate | Shopping Centers and Malls | Lancaster, PA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   3,140    
Building and improvements   63    
Costs capitalized subsequent to acquisition   2,131    
Gross amount at which carried at close of period        
Land   3,140    
Building and improvements   2,194    
Total   5,334    
Accumulated depreciation and amortization   (886)    
Real Estate | Shopping Centers and Malls | Las Catalinas, Puerto Rico        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   130,000    
Initial cost to company        
Land   15,280    
Building and improvements   64,370    
Costs capitalized subsequent to acquisition   15,438    
Gross amount at which carried at close of period        
Land   15,280    
Building and improvements   79,808    
Total   95,088    
Accumulated depreciation and amortization   (38,631)    
Real Estate | Shopping Centers and Malls | Lawnside, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   1,226    
Building and improvements   3,164    
Costs capitalized subsequent to acquisition   2,896    
Gross amount at which carried at close of period        
Land   1,226    
Building and improvements   6,060    
Total   7,286    
Accumulated depreciation and amortization   (3,857)    
Real Estate | Shopping Centers and Malls | Lodi (Route 17 North), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   238    
Building and improvements   9,446    
Costs capitalized subsequent to acquisition   42    
Gross amount at which carried at close of period        
Land   238    
Building and improvements   9,488    
Total   9,726    
Accumulated depreciation and amortization   (4,544)    
Real Estate | Shopping Centers and Malls | Lodi (Washington Street), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   7,606    
Building and improvements   13,125    
Costs capitalized subsequent to acquisition   2,754    
Gross amount at which carried at close of period        
Land   7,606    
Building and improvements   15,879    
Total   23,485    
Accumulated depreciation and amortization   (5,292)    
Real Estate | Shopping Centers and Malls | Manalapan, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   725    
Building and improvements   7,189    
Costs capitalized subsequent to acquisition   6,982    
Gross amount at which carried at close of period        
Land   1,046    
Building and improvements   13,850    
Total   14,896    
Accumulated depreciation and amortization   (9,912)    
Real Estate | Shopping Centers and Malls | Manchester, MO        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   12,500    
Initial cost to company        
Land   4,409    
Building and improvements   13,756    
Costs capitalized subsequent to acquisition   13    
Gross amount at which carried at close of period        
Land   4,409    
Building and improvements   13,769    
Total   18,178    
Accumulated depreciation and amortization   (696)    
Real Estate | Shopping Centers and Malls | Marlton, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   37,400    
Initial cost to company        
Land   1,611    
Building and improvements   3,464    
Costs capitalized subsequent to acquisition   14,140    
Gross amount at which carried at close of period        
Land   1,454    
Building and improvements   17,761    
Total   19,215    
Accumulated depreciation and amortization   (11,151)    
Real Estate | Shopping Centers and Malls | Middletown, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   31,400    
Initial cost to company        
Land   283    
Building and improvements   5,248    
Costs capitalized subsequent to acquisition   3,147    
Gross amount at which carried at close of period        
Land   283    
Building and improvements   8,395    
Total   8,678    
Accumulated depreciation and amortization   (6,722)    
Real Estate | Shopping Centers and Malls | Milford (leased through 2019), MA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   0    
Costs capitalized subsequent to acquisition   0    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   0    
Total   0    
Accumulated depreciation and amortization   0    
Real Estate | Shopping Centers and Malls | Millburn, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   24,000    
Initial cost to company        
Land   15,783    
Building and improvements   25,837    
Costs capitalized subsequent to acquisition   (911)    
Gross amount at which carried at close of period        
Land   15,783    
Building and improvements   24,926    
Total   40,709    
Accumulated depreciation and amortization   (2,096)    
Real Estate | Shopping Centers and Malls | Montclair, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   66    
Building and improvements   419    
Costs capitalized subsequent to acquisition   1,439    
Gross amount at which carried at close of period        
Land   448    
Building and improvements   1,476    
Total   1,924    
Accumulated depreciation and amortization   (743)    
Real Estate | Shopping Centers and Malls | Montehiedra, Puerto Rico        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   114,860    
Initial cost to company        
Land   9,182    
Building and improvements   66,751    
Costs capitalized subsequent to acquisition   27,829    
Gross amount at which carried at close of period        
Land   9,267    
Building and improvements   94,495    
Total   103,762    
Accumulated depreciation and amortization   (42,620)    
Real Estate | Shopping Centers and Malls | Morris Plains, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   1,104    
Building and improvements   6,411    
Costs capitalized subsequent to acquisition   5,576    
Gross amount at which carried at close of period        
Land   1,104    
Building and improvements   11,987    
Total   13,091    
Accumulated depreciation and amortization   (7,181)    
Real Estate | Shopping Centers and Malls | Mount Kisco, NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   13,987    
Initial cost to company        
Land   22,700    
Building and improvements   26,700    
Costs capitalized subsequent to acquisition   1,840    
Gross amount at which carried at close of period        
Land   22,614    
Building and improvements   28,626    
Total   51,240    
Accumulated depreciation and amortization   (7,371)    
Real Estate | Shopping Centers and Malls | New Hyde Park (leased through 2029), NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   4    
Costs capitalized subsequent to acquisition   0    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   4    
Total   4    
Accumulated depreciation and amortization   (4)    
Real Estate | Shopping Centers and Malls | Newington, CT        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   2,421    
Building and improvements   1,200    
Costs capitalized subsequent to acquisition   2,052    
Gross amount at which carried at close of period        
Land   2,421    
Building and improvements   3,252    
Total   5,673    
Accumulated depreciation and amortization   (1,401)    
Real Estate | Shopping Centers and Malls | Norfolk (leased through 2020), VA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   3,927    
Costs capitalized subsequent to acquisition   15    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   3,942    
Total   3,942    
Accumulated depreciation and amortization   (3,686)    
Real Estate | Shopping Centers and Malls | North Bergen (Kennedy Boulevard), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   2,308    
Building and improvements   636    
Costs capitalized subsequent to acquisition   261    
Gross amount at which carried at close of period        
Land   2,308    
Building and improvements   897    
Total   3,205    
Accumulated depreciation and amortization   (575)    
Real Estate | Shopping Centers and Malls | North Bergen (Tonnelle Avenue), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   100,000    
Initial cost to company        
Land   24,493    
Building and improvements   0    
Costs capitalized subsequent to acquisition   73,062    
Gross amount at which carried at close of period        
Land   33,988    
Building and improvements   63,567    
Total   97,555    
Accumulated depreciation and amortization   (16,298)    
Real Estate | Shopping Centers and Malls | North Plainfield, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   25,100    
Initial cost to company        
Land   6,577    
Building and improvements   13,983    
Costs capitalized subsequent to acquisition   693    
Gross amount at which carried at close of period        
Land   6,577    
Building and improvements   14,676    
Total   21,253    
Accumulated depreciation and amortization   (4,056)    
Real Estate | Shopping Centers and Malls | Oceanside, NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   2,710    
Building and improvements   2,306    
Costs capitalized subsequent to acquisition   0    
Gross amount at which carried at close of period        
Land   2,710    
Building and improvements   2,306    
Total   5,016    
Accumulated depreciation and amortization   (668)    
Real Estate | Shopping Centers and Malls | Paramus (leased through 2033), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   0    
Costs capitalized subsequent to acquisition   12,569    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   12,569    
Total   12,569    
Accumulated depreciation and amortization   (4,310)    
Real Estate | Shopping Centers and Malls | Queens, NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   14,537    
Building and improvements   12,304    
Costs capitalized subsequent to acquisition   3,744    
Gross amount at which carried at close of period        
Land   14,537    
Building and improvements   16,048    
Total   30,585    
Accumulated depreciation and amortization   (1,258)    
Real Estate | Shopping Centers and Malls | Rochester (Henrietta) (leased through 2026), NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   2,647    
Costs capitalized subsequent to acquisition   1,293    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   3,940    
Total   3,940    
Accumulated depreciation and amortization   (3,604)    
Real Estate | Shopping Centers and Malls | Rochester, NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   2,172    
Building and improvements   0    
Costs capitalized subsequent to acquisition   0    
Gross amount at which carried at close of period        
Land   2,172    
Building and improvements   0    
Total   2,172    
Accumulated depreciation and amortization   0    
Real Estate | Shopping Centers and Malls | Rockville, MD        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   3,470    
Building and improvements   20,599    
Costs capitalized subsequent to acquisition   2,736    
Gross amount at which carried at close of period        
Land   3,470    
Building and improvements   23,335    
Total   26,805    
Accumulated depreciation and amortization   (8,084)    
Real Estate | Shopping Centers and Malls | Salem (leased through 2061), NH        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   6,083    
Building and improvements   0    
Costs capitalized subsequent to acquisition   (3,084)    
Gross amount at which carried at close of period        
Land   2,994    
Building and improvements   5    
Total   2,999    
Accumulated depreciation and amortization   0    
Real Estate | Shopping Centers and Malls | Signal Hill, CA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   9,652    
Building and improvements   2,940    
Costs capitalized subsequent to acquisition   1    
Gross amount at which carried at close of period        
Land   9,652    
Building and improvements   2,941    
Total   12,593    
Accumulated depreciation and amortization   (901)    
Real Estate | Shopping Centers and Malls | South Plainfield (leased through 2039)(3), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   10,044    
Costs capitalized subsequent to acquisition   2,240    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   12,284    
Total   12,284    
Accumulated depreciation and amortization   (3,659)    
Real Estate | Shopping Centers and Malls | Springfield, MA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   0    
Costs capitalized subsequent to acquisition   80    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   80    
Total   80    
Accumulated depreciation and amortization   (80)    
Real Estate | Shopping Centers and Malls | Springfield (leased through 2025), PA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   2,797    
Building and improvements   2,471    
Costs capitalized subsequent to acquisition   1,244    
Gross amount at which carried at close of period        
Land   2,797    
Building and improvements   3,715    
Total   6,512    
Accumulated depreciation and amortization   (1,353)    
Real Estate | Shopping Centers and Malls | Staten Island, NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   11,446    
Building and improvements   21,262    
Costs capitalized subsequent to acquisition   4,378    
Gross amount at which carried at close of period        
Land   11,446    
Building and improvements   25,640    
Total   37,086    
Accumulated depreciation and amortization   (9,424)    
Real Estate | Shopping Centers and Malls | Totowa, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   50,800    
Initial cost to company        
Land   120    
Building and improvements   11,994    
Costs capitalized subsequent to acquisition   4,910    
Gross amount at which carried at close of period        
Land   92    
Building and improvements   16,932    
Total   17,024    
Accumulated depreciation and amortization   (14,008)    
Real Estate | Shopping Centers and Malls | Turnersville, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   900    
Building and improvements   1,342    
Costs capitalized subsequent to acquisition   3,056    
Gross amount at which carried at close of period        
Land   900    
Building and improvements   4,398    
Total   5,298    
Accumulated depreciation and amortization   (2,341)    
Real Estate | Shopping Centers and Malls | Tyson’s Corner (leased through 2035), VA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   0    
Costs capitalized subsequent to acquisition   0    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   0    
Total   0    
Accumulated depreciation and amortization   0    
Real Estate | Shopping Centers and Malls | Union (2445 Springfield Avenue), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   45,600    
Initial cost to company        
Land   19,700    
Building and improvements   45,090    
Costs capitalized subsequent to acquisition   0    
Gross amount at which carried at close of period        
Land   19,700    
Building and improvements   45,090    
Total   64,790    
Accumulated depreciation and amortization   (13,057)    
Real Estate | Shopping Centers and Malls | Union (Route 22 and Morris Avenue), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   3,025    
Building and improvements   7,470    
Costs capitalized subsequent to acquisition   2,780    
Gross amount at which carried at close of period        
Land   3,025    
Building and improvements   10,250    
Total   13,275    
Accumulated depreciation and amortization   (6,041)    
Real Estate | Shopping Centers and Malls | Vallejo (leased through 2043), CA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   2,945    
Costs capitalized subsequent to acquisition   221    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   3,166    
Total   3,166    
Accumulated depreciation and amortization   (1,073)    
Real Estate | Shopping Centers and Malls | Walnut Creek (1149 South Main Street), CA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   2,699    
Building and improvements   19,930    
Costs capitalized subsequent to acquisition   (1,000)    
Gross amount at which carried at close of period        
Land   2,699    
Building and improvements   18,930    
Total   21,629    
Accumulated depreciation and amortization   (1,552)    
Real Estate | Shopping Centers and Malls | Walnut Creek (Mt. Diablo), CA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   5,909    
Building and improvements   0    
Costs capitalized subsequent to acquisition   1,540    
Gross amount at which carried at close of period        
Land   5,908    
Building and improvements   1,541    
Total   7,449    
Accumulated depreciation and amortization   (262)    
Real Estate | Shopping Centers and Malls | Watchung, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   27,000    
Initial cost to company        
Land   4,178    
Building and improvements   5,463    
Costs capitalized subsequent to acquisition   2,939    
Gross amount at which carried at close of period        
Land   4,441    
Building and improvements   8,139    
Total   12,580    
Accumulated depreciation and amortization   (5,715)    
Real Estate | Shopping Centers and Malls | West Babylon, NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   6,720    
Building and improvements   13,786    
Costs capitalized subsequent to acquisition   (4,160)    
Gross amount at which carried at close of period        
Land   6,720    
Building and improvements   9,626    
Total   16,346    
Accumulated depreciation and amortization   (8)    
Real Estate | Shopping Centers and Malls | Westfield, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   4,730    
Initial cost to company        
Land   5,728    
Building and improvements   4,305    
Costs capitalized subsequent to acquisition   (211)    
Gross amount at which carried at close of period        
Land   5,728    
Building and improvements   4,094    
Total   9,822    
Accumulated depreciation and amortization   (255)    
Real Estate | Shopping Centers and Malls | Wheaton (leased through 2060)(3), MD        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   5,367    
Costs capitalized subsequent to acquisition   0    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   5,367    
Total   5,367    
Accumulated depreciation and amortization   (1,644)    
Real Estate | Shopping Centers and Malls | Wilkes-Barre (461 - 499 Mundy Street), PA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   6,053    
Building and improvements   26,646    
Costs capitalized subsequent to acquisition   1,932    
Gross amount at which carried at close of period        
Land   6,053    
Building and improvements   28,578    
Total   34,631    
Accumulated depreciation and amortization   (8,140)    
Real Estate | Shopping Centers and Malls | Woodbridge (Woodbridge Commons), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   22,100    
Initial cost to company        
Land   1,509    
Building and improvements   2,675    
Costs capitalized subsequent to acquisition   4,997    
Gross amount at which carried at close of period        
Land   1,539    
Building and improvements   7,642    
Total   9,181    
Accumulated depreciation and amortization   (3,094)    
Real Estate | Shopping Centers and Malls | Woodbridge (Plaza at Woodbridge), NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   55,340    
Initial cost to company        
Land   21,547    
Building and improvements   75,017    
Costs capitalized subsequent to acquisition   (2,753)    
Gross amount at which carried at close of period        
Land   17,280    
Building and improvements   76,531    
Total   93,811    
Accumulated depreciation and amortization   (4,885)    
Real Estate | Shopping Centers and Malls | Wyomissing (leased through 2025), PA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   0    
Building and improvements   2,646    
Costs capitalized subsequent to acquisition   1,961    
Gross amount at which carried at close of period        
Land   0    
Building and improvements   4,607    
Total   4,607    
Accumulated depreciation and amortization   (3,887)    
Real Estate | Shopping Centers and Malls | Yonkers, NY        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   31,704    
Initial cost to company        
Land   63,341    
Building and improvements   110,635    
Costs capitalized subsequent to acquisition   15,010    
Gross amount at which carried at close of period        
Land   63,461    
Building and improvements   125,525    
Total   188,986    
Accumulated depreciation and amortization   (6,580)    
Real Estate | Shopping Centers and Malls | York, PA        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances   0    
Initial cost to company        
Land   409    
Building and improvements   2,568    
Costs capitalized subsequent to acquisition   2,504    
Gross amount at which carried at close of period        
Land   409    
Building and improvements   5,072    
Total   5,481    
Accumulated depreciation and amortization   $ (3,482)    
Real Estate | Warehouses | East Hanover, NJ        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 40,700      
Initial cost to company        
Land 576      
Building and improvements 7,752      
Costs capitalized subsequent to acquisition 30,832      
Gross amount at which carried at close of period        
Land 691      
Building and improvements 38,469      
Total 39,160      
Accumulated depreciation and amortization (18,352)      
Leasehold Improvements, Equipment and Other        
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]        
Encumbrances 0      
Initial cost to company        
Land 0      
Building and improvements 0      
Costs capitalized subsequent to acquisition 6,675      
Gross amount at which carried at close of period        
Land 0      
Building and improvements 6,675      
Total 6,675      
Accumulated depreciation and amortization $ (1,505)      
Buildings & improvements        
Gross amount at which carried at close of period        
Life used for depreciation 40 years