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Schedule III - REAL ESTATE ASSETS AND ACCUMULATED DEPRECIATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 1,188,264      
Initial Cost, Land 721,243      
Initial Cost, Buildings and Improvements 4,267,989      
Costs Capitalized Subsequent to Acquisition 912,664      
Sales of Outparcel Land (42,783)      
Gross Amounts at Which Carried at Close of Period, Land 695,711      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 5,163,402      
Gross Amounts at Which Carried at Close of Period, Total 5,859,113 $ 6,411,400 $ 7,278,608 $ 7,621,930
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (2,241,421) $ (2,349,404) $ (2,493,082) $ (2,465,095)
Land and buildings and improvements, gross $ 6,921,000      
Buildings        
Real Estate And Accumulated Depreciation [Line Items]        
Estimated useful life 40 years      
Certain Improvements | Minimum        
Real Estate And Accumulated Depreciation [Line Items]        
Estimated useful life 10 years      
Certain Improvements | Maximum        
Real Estate And Accumulated Depreciation [Line Items]        
Estimated useful life 20 years      
Equipment and Fixtures | Minimum        
Real Estate And Accumulated Depreciation [Line Items]        
Estimated useful life 7 years      
Equipment and Fixtures | Maximum        
Real Estate And Accumulated Depreciation [Line Items]        
Estimated useful life 10 years      
Alamance Crossing, Burlington, NC        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances $ 43,563      
Initial Cost, Land 20,853      
Initial Cost, Buildings and Improvements 62,852      
Costs Capitalized Subsequent to Acquisition 39,749      
Sales of Outparcel Land (3,373)      
Gross Amounts at Which Carried at Close of Period, Land 17,481      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 102,600      
Gross Amounts at Which Carried at Close of Period, Total 120,081      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (42,961)      
Arbor Place Atlanta (Douglasville), GA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 104,384      
Initial Cost, Land 8,508      
Initial Cost, Buildings and Improvements 95,088      
Costs Capitalized Subsequent to Acquisition 27,420      
Gross Amounts at Which Carried at Close of Period, Land 8,508      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 122,508      
Gross Amounts at Which Carried at Close of Period, Total 131,016      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (75,710)      
Asheville Mall, Asheville, NC        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 62,121      
Initial Cost, Land 7,139      
Initial Cost, Buildings and Improvements 58,386      
Costs Capitalized Subsequent to Acquisition (13,213)      
Sales of Outparcel Land (805)      
Gross Amounts at Which Carried at Close of Period, Land 6,334      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 45,173      
Gross Amounts at Which Carried at Close of Period, Total 51,507      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (1,893)      
Brookfield Square Anchor Redevelopment        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 27,461      
Initial Cost, Land 8,996      
Initial Cost, Buildings and Improvements 78,533      
Costs Capitalized Subsequent to Acquisition 110,138      
Sales of Outparcel Land (5,208)      
Gross Amounts at Which Carried at Close of Period, Land 20,202      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 172,257      
Gross Amounts at Which Carried at Close of Period, Total 192,459      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (79,852)      
CherryVale Mall, Rockford, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 11,892      
Initial Cost, Buildings and Improvements 64,117      
Costs Capitalized Subsequent to Acquisition 56,907      
Sales of Outparcel Land (1,667)      
Gross Amounts at Which Carried at Close of Period, Land 11,608      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 119,641      
Gross Amounts at Which Carried at Close of Period, Total 131,249      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (59,158)      
Cross Creek Mall, Fayetteville, NC        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 106,883      
Initial Cost, Land 19,155      
Initial Cost, Buildings and Improvements 104,378      
Costs Capitalized Subsequent to Acquisition 45,271      
Gross Amounts at Which Carried at Close of Period, Land 31,539      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 137,265      
Gross Amounts at Which Carried at Close of Period, Total 168,804      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (67,235)      
Dakota Square Mall, Minot, ND        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 4,552      
Initial Cost, Buildings and Improvements 87,625      
Costs Capitalized Subsequent to Acquisition 34,819      
Gross Amounts at Which Carried at Close of Period, Land 4,472      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 122,524      
Gross Amounts at Which Carried at Close of Period, Total 126,996      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (34,325)      
East Towne Mall, Madison, WI        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 4,496      
Initial Cost, Buildings and Improvements 63,867      
Costs Capitalized Subsequent to Acquisition 66,768      
Sales of Outparcel Land (909)      
Gross Amounts at Which Carried at Close of Period, Land 4,387      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 129,835      
Gross Amounts at Which Carried at Close of Period, Total 134,222      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (59,036)      
Eastland Mall, Bloomington, IL        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 5,746      
Initial Cost, Buildings and Improvements 75,893      
Costs Capitalized Subsequent to Acquisition (54,375)      
Sales of Outparcel Land (753)      
Gross Amounts at Which Carried at Close of Period, Land 3,150      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 23,361      
Gross Amounts at Which Carried at Close of Period, Total 26,511      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (2,687)      
EastGate Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 31,181      
Initial Cost, Land 13,046      
Initial Cost, Buildings and Improvements 44,949      
Costs Capitalized Subsequent to Acquisition (39,420)      
Sales of Outparcel Land (1,017)      
Gross Amounts at Which Carried at Close of Period, Land 4,959      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 12,599      
Gross Amounts at Which Carried at Close of Period, Total 17,558      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (436)      
Greenbrier Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 61,647      
Initial Cost, Land 3,181      
Initial Cost, Buildings and Improvements 107,355      
Costs Capitalized Subsequent to Acquisition (68,295)      
Sales of Outparcel Land (626)      
Gross Amounts at Which Carried at Close of Period, Land 2,555      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 39,060      
Gross Amounts at Which Carried at Close of Period, Total 41,615      
Fayette Mall, Lexington, KY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 141,393      
Initial Cost, Land 25,205      
Initial Cost, Buildings and Improvements 84,256      
Costs Capitalized Subsequent to Acquisition 107,287      
Gross Amounts at Which Carried at Close of Period, Land 25,205      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 191,543      
Gross Amounts at Which Carried at Close of Period, Total 216,748      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (78,821)      
Frontier Mall, Cheyenne, WY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 2,681      
Initial Cost, Buildings and Improvements 15,858      
Costs Capitalized Subsequent to Acquisition 21,254      
Sales of Outparcel Land (83)      
Gross Amounts at Which Carried at Close of Period, Land 2,598      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 37,112      
Gross Amounts at Which Carried at Close of Period, Total 39,710      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (27,582)      
Hamilton Place, Chattanooga, TN        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 98,396      
Initial Cost, Land 3,532      
Initial Cost, Buildings and Improvements 42,619      
Costs Capitalized Subsequent to Acquisition 95,161      
Sales of Outparcel Land (2,384)      
Gross Amounts at Which Carried at Close of Period, Land 7,315      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 131,613      
Gross Amounts at Which Carried at Close of Period, Total 138,928      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (69,660)      
Hanes Mall, Winston-Salem, NC        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 17,176      
Initial Cost, Buildings and Improvements 133,376      
Costs Capitalized Subsequent to Acquisition 55,187      
Sales of Outparcel Land (1,767)      
Gross Amounts at Which Carried at Close of Period, Land 17,810      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 186,162      
Gross Amounts at Which Carried at Close of Period, Total 203,972      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (94,334)      
Harford Mall, Bel Air, MD        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 8,699      
Initial Cost, Buildings and Improvements 45,704      
Costs Capitalized Subsequent to Acquisition 21,309      
Gross Amounts at Which Carried at Close of Period, Land 8,699      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 67,013      
Gross Amounts at Which Carried at Close of Period, Total 75,712      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (33,133)      
Laurel Park Place Livonia, MI        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 13,289      
Initial Cost, Buildings and Improvements 92,579      
Costs Capitalized Subsequent to Acquisition (79,562)      
Gross Amounts at Which Carried at Close of Period, Land 7,500      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 18,806      
Gross Amounts at Which Carried at Close of Period, Total 26,306      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (1,652)      
Imperial Valley Mall, El Centro, CA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 35,378      
Initial Cost, Buildings and Improvements 71,753      
Costs Capitalized Subsequent to Acquisition 7,451      
Gross Amounts at Which Carried at Close of Period, Land 40,579      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 74,003      
Gross Amounts at Which Carried at Close of Period, Total 114,582      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (20,155)      
Kirkwood Mall, Bismarck, ND        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 3,368      
Initial Cost, Buildings and Improvements 118,945      
Costs Capitalized Subsequent to Acquisition 29,480      
Gross Amounts at Which Carried at Close of Period, Land 3,448      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 148,345      
Gross Amounts at Which Carried at Close of Period, Total 151,793      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (37,489)      
Jefferson Mall, Louisville, KY        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 60,852      
Initial Cost, Land 13,125      
Initial Cost, Buildings and Improvements 40,234      
Costs Capitalized Subsequent to Acquisition 45,255      
Sales of Outparcel Land (521)      
Gross Amounts at Which Carried at Close of Period, Land 17,850      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 80,243      
Gross Amounts at Which Carried at Close of Period, Total 98,093      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (42,686)      
Layton Hills Mall, Layton, UT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 20,464      
Initial Cost, Buildings and Improvements 99,836      
Costs Capitalized Subsequent to Acquisition (4,315)      
Sales of Outparcel Land (1,165)      
Gross Amounts at Which Carried at Close of Period, Land 13,060      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 101,760      
Gross Amounts at Which Carried at Close of Period, Total 114,820      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (42,701)      
Mall Del Norte, Laredo, TX        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 21,734      
Initial Cost, Buildings and Improvements 142,049      
Costs Capitalized Subsequent to Acquisition 59,011      
Sales of Outparcel Land (149)      
Gross Amounts at Which Carried at Close of Period, Land 21,667      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 200,978      
Gross Amounts at Which Carried at Close of Period, Total 222,645      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (98,183)      
Mayfaire Town Centerand Community Center        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 26,333      
Initial Cost, Buildings and Improvements 101,087      
Costs Capitalized Subsequent to Acquisition 20,349      
Gross Amounts at Which Carried at Close of Period, Land 26,444      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 121,325      
Gross Amounts at Which Carried at Close of Period, Total 147,769      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (20,084)      
Meridian Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 2,797      
Initial Cost, Buildings and Improvements 103,678      
Costs Capitalized Subsequent to Acquisition 69,329      
Gross Amounts at Which Carried at Close of Period, Land 4,501      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 171,303      
Gross Amounts at Which Carried at Close of Period, Total 175,804      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (94,761)      
Mid Rivers Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 16,384      
Initial Cost, Buildings and Improvements 170,582      
Costs Capitalized Subsequent to Acquisition (130,358)      
Sales of Outparcel Land (4,174)      
Gross Amounts at Which Carried at Close of Period, Land 11,840      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 40,594      
Gross Amounts at Which Carried at Close of Period, Total 52,434      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (2,480)      
Monroeville Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 22,911      
Initial Cost, Buildings and Improvements 177,214      
Costs Capitalized Subsequent to Acquisition (134,699)      
Gross Amounts at Which Carried at Close of Period, Land 15,251      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 50,175      
Gross Amounts at Which Carried at Close of Period, Total 65,426      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (2,252)      
Northgate Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 2,330      
Initial Cost, Buildings and Improvements 8,960      
Costs Capitalized Subsequent to Acquisition 26,034      
Sales of Outparcel Land (492)      
Gross Amounts at Which Carried at Close of Period, Land 3,000      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 33,832      
Gross Amounts at Which Carried at Close of Period, Total 36,832      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (15,647)      
Northpark Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 9,977      
Initial Cost, Buildings and Improvements 65,481      
Costs Capitalized Subsequent to Acquisition 43,375      
Gross Amounts at Which Carried at Close of Period, Land 11,071      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 107,762      
Gross Amounts at Which Carried at Close of Period, Total 118,833      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (55,171)      
Old Hickory Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 15,527      
Initial Cost, Buildings and Improvements 29,413      
Costs Capitalized Subsequent to Acquisition 8,155      
Sales of Outparcel Land (362)      
Gross Amounts at Which Carried at Close of Period, Land 15,169      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 37,564      
Gross Amounts at Which Carried at Close of Period, Total 52,733      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (20,106)      
The Outlet Shoppes at Laredo        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 40,600      
Initial Cost, Land 11,000      
Initial Cost, Buildings and Improvements 97,353      
Costs Capitalized Subsequent to Acquisition (66,620)      
Gross Amounts at Which Carried at Close of Period, Land 5,000      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 36,733      
Gross Amounts at Which Carried at Close of Period, Total 41,733      
Parkdale Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 74,406      
Initial Cost, Land 23,850      
Initial Cost, Buildings and Improvements 47,390      
Costs Capitalized Subsequent to Acquisition 75,315      
Sales of Outparcel Land (874)      
Gross Amounts at Which Carried at Close of Period, Land 24,814      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 120,867      
Gross Amounts at Which Carried at Close of Period, Total 145,681      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (51,711)      
Pearland Town Center        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 16,300      
Initial Cost, Buildings and Improvements 108,615      
Costs Capitalized Subsequent to Acquisition 17,838      
Sales of Outparcel Land (857)      
Gross Amounts at Which Carried at Close of Period, Land 15,252      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 126,644      
Gross Amounts at Which Carried at Close of Period, Total 141,896      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (52,253)      
Northwoods Mall Northwoods Mall North Charleston, SC        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 62,284      
Initial Cost, Land 14,867      
Initial Cost, Buildings and Improvements 49,647      
Costs Capitalized Subsequent to Acquisition 28,963      
Sales of Outparcel Land (2,339)      
Gross Amounts at Which Carried at Close of Period, Land 12,528      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 78,610      
Gross Amounts at Which Carried at Close of Period, Total 91,138      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (38,332)      
Post Oak Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 3,936      
Initial Cost, Buildings and Improvements 48,948      
Costs Capitalized Subsequent to Acquisition 17,593      
Sales of Outparcel Land (327)      
Gross Amounts at Which Carried at Close of Period, Land 3,852      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 66,298      
Gross Amounts at Which Carried at Close of Period, Total 70,150      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (44,216)      
Richland Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 9,874      
Initial Cost, Buildings and Improvements 34,793      
Costs Capitalized Subsequent to Acquisition 23,044      
Sales of Outparcel Land (1,225)      
Gross Amounts at Which Carried at Close of Period, Land 8,662      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 57,824      
Gross Amounts at Which Carried at Close of Period, Total 66,486      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (28,548)      
The Outlet Shoppes at Gettysburg Gettysburg, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 36,774      
Initial Cost, Land 20,779      
Initial Cost, Buildings and Improvements 22,180      
Costs Capitalized Subsequent to Acquisition 2,781      
Gross Amounts at Which Carried at Close of Period, Land 21,032      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 24,708      
Gross Amounts at Which Carried at Close of Period, Total 45,740      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (7,402)      
Park Plaza Little Rock, AR        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 76,805      
Initial Cost, Land 6,297      
Initial Cost, Buildings and Improvements 81,638      
Costs Capitalized Subsequent to Acquisition (49,910)      
Gross Amounts at Which Carried at Close of Period, Land 6,304      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 31,721      
Gross Amounts at Which Carried at Close of Period, Total 38,025      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (2,224)      
Southpark Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 57,039      
Initial Cost, Land 9,501      
Initial Cost, Buildings and Improvements 73,262      
Costs Capitalized Subsequent to Acquisition 40,713      
Gross Amounts at Which Carried at Close of Period, Land 11,282      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 112,194      
Gross Amounts at Which Carried at Close of Period, Total 123,476      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (54,047)      
St Clair Square        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 11,027      
Initial Cost, Buildings and Improvements 75,620      
Costs Capitalized Subsequent to Acquisition 41,889      
Gross Amounts at Which Carried at Close of Period, Land 11,027      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 117,509      
Gross Amounts at Which Carried at Close of Period, Total 128,536      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (65,327)      
Parkway Place        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 6,364      
Initial Cost, Buildings and Improvements 67,067      
Costs Capitalized Subsequent to Acquisition 6,327      
Gross Amounts at Which Carried at Close of Period, Land 6,364      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 73,394      
Gross Amounts at Which Carried at Close of Period, Total 79,758      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (25,084)      
Stroud Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 14,711      
Initial Cost, Buildings and Improvements 23,936      
Costs Capitalized Subsequent to Acquisition 22,445      
Gross Amounts at Which Carried at Close of Period, Land 14,711      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 46,381      
Gross Amounts at Which Carried at Close of Period, Total 61,092      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (22,977)      
Sunrise Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 11,156      
Initial Cost, Buildings and Improvements 59,047      
Costs Capitalized Subsequent to Acquisition 14,214      
Gross Amounts at Which Carried at Close of Period, Land 11,156      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 73,261      
Gross Amounts at Which Carried at Close of Period, Total 84,417      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (33,050)      
Turtle Creek Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 2,345      
Initial Cost, Buildings and Improvements 26,418      
Costs Capitalized Subsequent to Acquisition 17,669      
Gross Amounts at Which Carried at Close of Period, Land 3,535      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 42,897      
Gross Amounts at Which Carried at Close of Period, Total 46,432      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (28,666)      
South County Center St. Louis, MO        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 15,754      
Initial Cost, Buildings and Improvements 159,249      
Costs Capitalized Subsequent to Acquisition 15,424      
Gross Amounts at Which Carried at Close of Period, Land 15,791      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 174,636      
Gross Amounts at Which Carried at Close of Period, Total 190,427      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (66,751)      
Southaven Towne Center Southaven, MS        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 8,255      
Initial Cost, Buildings and Improvements 29,380      
Costs Capitalized Subsequent to Acquisition 10,005      
Gross Amounts at Which Carried at Close of Period, Land 11,384      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 36,256      
Gross Amounts at Which Carried at Close of Period, Total 47,640      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (16,315)      
Valley View Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 15,985      
Initial Cost, Buildings and Improvements 77,771      
Costs Capitalized Subsequent to Acquisition 24,217      
Gross Amounts at Which Carried at Close of Period, Land 15,999      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 101,974      
Gross Amounts at Which Carried at Close of Period, Total 117,973      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (47,400)      
Volusia Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 46,510      
Initial Cost, Land 2,526      
Initial Cost, Buildings and Improvements 120,242      
Costs Capitalized Subsequent to Acquisition 37,360      
Gross Amounts at Which Carried at Close of Period, Land 8,945      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 151,183      
Gross Amounts at Which Carried at Close of Period, Total 160,128      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (64,533)      
West Towne Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 8,912      
Initial Cost, Buildings and Improvements 83,084      
Costs Capitalized Subsequent to Acquisition 44,600      
Gross Amounts at Which Carried at Close of Period, Land 8,912      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 127,684      
Gross Amounts at Which Carried at Close of Period, Total 136,596      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (63,262)      
Westgate Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 31,578      
Initial Cost, Land 2,149      
Initial Cost, Buildings and Improvements 23,257      
Costs Capitalized Subsequent to Acquisition 51,611      
Sales of Outparcel Land (432)      
Gross Amounts at Which Carried at Close of Period, Land 1,742      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 74,843      
Gross Amounts at Which Carried at Close of Period, Total 76,585      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (46,349)      
Westmoreland Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 4,621      
Initial Cost, Buildings and Improvements 84,215      
Costs Capitalized Subsequent to Acquisition 35,650      
Sales of Outparcel Land (1,240)      
Gross Amounts at Which Carried at Close of Period, Land 3,381      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 119,865      
Gross Amounts at Which Carried at Close of Period, Total 123,246      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (54,171)      
York Galleria        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 5,757      
Initial Cost, Buildings and Improvements 63,316      
Costs Capitalized Subsequent to Acquisition 19,637      
Gross Amounts at Which Carried at Close of Period, Land 5,757      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 82,953      
Gross Amounts at Which Carried at Close of Period, Total 88,710      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (43,555)      
A840 Greenbrier Circle        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 2,096      
Initial Cost, Buildings and Improvements 3,091      
Costs Capitalized Subsequent to Acquisition 1,151      
Gross Amounts at Which Carried at Close of Period, Land 2,096      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 4,242      
Gross Amounts at Which Carried at Close of Period, Total 6,338      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (1,778)      
Annex at Monroeville Pittsburgh, PA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Buildings and Improvements 29,496      
Costs Capitalized Subsequent to Acquisition 1,626      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 31,122      
Gross Amounts at Which Carried at Close of Period, Total 31,122      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (12,254)      
Cbl Center        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 16,182      
Initial Cost, Land 1,332      
Initial Cost, Buildings and Improvements 24,675      
Costs Capitalized Subsequent to Acquisition 1,337      
Gross Amounts at Which Carried at Close of Period, Land 1,864      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 25,480      
Gross Amounts at Which Carried at Close of Period, Total 27,344      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (16,047)      
Cbl Center Ii        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 22      
Initial Cost, Buildings and Improvements 13,648      
Costs Capitalized Subsequent to Acquisition 759      
Gross Amounts at Which Carried at Close of Period, Land 358      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 14,071      
Gross Amounts at Which Carried at Close of Period, Total 14,429      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (5,383)      
Cool Springs Crossing        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 2,803      
Initial Cost, Buildings and Improvements 14,985      
Costs Capitalized Subsequent to Acquisition 5,961      
Gross Amounts at Which Carried at Close of Period, Land 3,554      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 20,195      
Gross Amounts at Which Carried at Close of Period, Total 23,749      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (15,265)      
Courtyard At Hickory Hollow        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 3,314      
Initial Cost, Buildings and Improvements 2,771      
Costs Capitalized Subsequent to Acquisition 472      
Sales of Outparcel Land (231)      
Gross Amounts at Which Carried at Close of Period, Land 1,500      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 4,826      
Gross Amounts at Which Carried at Close of Period, Total 6,326      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (2,096)      
Frontier Square        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 346      
Initial Cost, Buildings and Improvements 684      
Costs Capitalized Subsequent to Acquisition 439      
Sales of Outparcel Land (86)      
Gross Amounts at Which Carried at Close of Period, Land 260      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 1,123      
Gross Amounts at Which Carried at Close of Period, Total 1,383      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (871)      
Gunbarrel Pointe        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 4,170      
Initial Cost, Buildings and Improvements 10,874      
Costs Capitalized Subsequent to Acquisition 3,650      
Gross Amounts at Which Carried at Close of Period, Land 4,170      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 14,524      
Gross Amounts at Which Carried at Close of Period, Total 18,694      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (7,545)      
Hamilton Corner        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 630      
Initial Cost, Buildings and Improvements 5,532      
Costs Capitalized Subsequent to Acquisition 8,628      
Gross Amounts at Which Carried at Close of Period, Land 734      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 14,056      
Gross Amounts at Which Carried at Close of Period, Total 14,790      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (8,914)      
Hamilton Crossing        
Real Estate And Accumulated Depreciation [Line Items]        
Encumbrances 8,205      
Initial Cost, Land 4,014      
Initial Cost, Buildings and Improvements 5,906      
Costs Capitalized Subsequent to Acquisition 6,942      
Sales of Outparcel Land (1,370)      
Gross Amounts at Which Carried at Close of Period, Land 2,644      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 12,848      
Gross Amounts at Which Carried at Close of Period, Total 15,492      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (8,309)      
Harford Annex        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 2,854      
Initial Cost, Buildings and Improvements 9,718      
Costs Capitalized Subsequent to Acquisition 1,278      
Gross Amounts at Which Carried at Close of Period, Land 2,854      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 10,996      
Gross Amounts at Which Carried at Close of Period, Total 13,850      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (5,019)      
The Landing at Arbor Place Atlanta (Douglasville), GA        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 7,238      
Initial Cost, Buildings and Improvements 14,330      
Costs Capitalized Subsequent to Acquisition 3,276      
Sales of Outparcel Land (2,242)      
Gross Amounts at Which Carried at Close of Period, Land 4,996      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 17,606      
Gross Amounts at Which Carried at Close of Period, Total 22,602      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (11,735)      
Layton Convenience Center Layton, UT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Buildings and Improvements 8      
Costs Capitalized Subsequent to Acquisition 5,728      
Gross Amounts at Which Carried at Close of Period, Land 2,795      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 2,941      
Gross Amounts at Which Carried at Close of Period, Total 5,736      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (1,903)      
Layton Hills Plaza Layton, UT        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Buildings and Improvements 2      
Costs Capitalized Subsequent to Acquisition 1,049      
Gross Amounts at Which Carried at Close of Period, Land 673      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 378      
Gross Amounts at Which Carried at Close of Period, Total 1,051      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (279)      
Parkdale Crossing        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 2,994      
Initial Cost, Buildings and Improvements 7,408      
Costs Capitalized Subsequent to Acquisition 2,769      
Sales of Outparcel Land (355)      
Gross Amounts at Which Carried at Close of Period, Land 2,639      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 10,177      
Gross Amounts at Which Carried at Close of Period, Total 12,816      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (4,504)      
Pearland Office        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Buildings and Improvements 7,849      
Costs Capitalized Subsequent to Acquisition 2,677      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 10,526      
Gross Amounts at Which Carried at Close of Period, Total 10,526      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (4,496)      
Pearland Residential Mgmt        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Buildings and Improvements 9,666      
Costs Capitalized Subsequent to Acquisition 9      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 9,675      
Gross Amounts at Which Carried at Close of Period, Total 9,675      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (3,331)      
The Plaza at Fayette Lexington, KY        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 9,531      
Initial Cost, Buildings and Improvements 27,646      
Costs Capitalized Subsequent to Acquisition 1,215      
Gross Amounts at Which Carried at Close of Period, Land 9,531      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 28,861      
Gross Amounts at Which Carried at Close of Period, Total 38,392      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (11,159)      
The Promenade D'lberville D'lberville, MS        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 16,278      
Initial Cost, Buildings and Improvements 48,806      
Costs Capitalized Subsequent to Acquisition 27,803      
Sales of Outparcel Land (706)      
Gross Amounts at Which Carried at Close of Period, Land 17,953      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 74,228      
Gross Amounts at Which Carried at Close of Period, Total 92,181      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (26,739)      
The Shoppes At St Clair Square        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 8,250      
Initial Cost, Buildings and Improvements 23,623      
Costs Capitalized Subsequent to Acquisition 910      
Sales of Outparcel Land (5,044)      
Gross Amounts at Which Carried at Close of Period, Land 4,436      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 23,303      
Gross Amounts at Which Carried at Close of Period, Total 27,739      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (11,322)      
Shoppes At Hamilton Place        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 4,894      
Initial Cost, Buildings and Improvements 11,700      
Costs Capitalized Subsequent to Acquisition 2,205      
Gross Amounts at Which Carried at Close of Period, Land 2,811      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 15,988      
Gross Amounts at Which Carried at Close of Period, Total 18,799      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (6,157)      
Burnsville Center        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 12,804      
Initial Cost, Buildings and Improvements 71,748      
Costs Capitalized Subsequent to Acquisition (84,552)      
Sunrise Commons        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 1,013      
Initial Cost, Buildings and Improvements 7,525      
Costs Capitalized Subsequent to Acquisition 1,799      
Gross Amounts at Which Carried at Close of Period, Land 1,013      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 9,324      
Gross Amounts at Which Carried at Close of Period, Total 10,337      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (4,430)      
Hickory Point Mall        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 10,731      
Initial Cost, Buildings and Improvements 31,728      
Costs Capitalized Subsequent to Acquisition (42,459)      
Terrace        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 4,166      
Initial Cost, Buildings and Improvements 9,929      
Costs Capitalized Subsequent to Acquisition 7,995      
Gross Amounts at Which Carried at Close of Period, Land 6,536      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 15,554      
Gross Amounts at Which Carried at Close of Period, Total 22,090      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (7,975)      
West Towne Crossing        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 1,784      
Initial Cost, Buildings and Improvements 2,955      
Costs Capitalized Subsequent to Acquisition 12,095      
Gross Amounts at Which Carried at Close of Period, Land 2,759      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 14,075      
Gross Amounts at Which Carried at Close of Period, Total 16,834      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (6,683)      
Westgate Crossing        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 1,082      
Initial Cost, Buildings and Improvements 3,422      
Costs Capitalized Subsequent to Acquisition 8,228      
Gross Amounts at Which Carried at Close of Period, Land 1,082      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 11,650      
Gross Amounts at Which Carried at Close of Period, Total 12,732      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (6,589)      
Westmoreland South        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 2,898      
Initial Cost, Buildings and Improvements 21,167      
Costs Capitalized Subsequent to Acquisition 9,267      
Gross Amounts at Which Carried at Close of Period, Land 2,898      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 30,434      
Gross Amounts at Which Carried at Close of Period, Total 33,332      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (14,137)      
Other Land        
Real Estate And Accumulated Depreciation [Line Items]        
Initial Cost, Land 21,559      
Initial Cost, Buildings and Improvements 4,002      
Costs Capitalized Subsequent to Acquisition (4,157)      
Gross Amounts at Which Carried at Close of Period, Land 19,923      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 1,481      
Gross Amounts at Which Carried at Close of Period, Total 21,404      
Gross Amounts at Which Carried at Close of Period, Accumulated Depreciation (138)      
Development In Progress Consisting Of Construction And Development Properties        
Real Estate And Accumulated Depreciation [Line Items]        
Costs Capitalized Subsequent to Acquisition 28,327      
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements 28,327      
Gross Amounts at Which Carried at Close of Period, Total $ 28,327