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Investments In Unconsolidated Joint Ventures (Summary Of Company's Investment In Unconsolidated Joint Ventures) (Details) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2013
Plaza VIII & IX Associates, L.L.C. [Member]
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Dec. 31, 2012
Plaza VIII & IX Associates, L.L.C. [Member]
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Dec. 31, 2013
South Pier At Harborside [Member]
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Dec. 31, 2012
South Pier At Harborside [Member]
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Dec. 31, 2013
Red Bank Corporate Plaza, L.L.C. [Member]
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Dec. 31, 2012
Red Bank Corporate Plaza, L.L.C. [Member]
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Dec. 31, 2013
12 Vreeland Associates, L.L.C. [Member]
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Dec. 31, 2012
12 Vreeland Associates, L.L.C. [Member]
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Dec. 31, 2012
Boston-Downtown Crossing [Member]
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Dec. 31, 2012
Gale Jefferson, L.L.C. [Member]
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Dec. 31, 2013
Stamford SM LLC [Member]
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Dec. 31, 2012
Stamford SM LLC [Member]
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Dec. 31, 2013
Marbella RoseGarden, L.L.C. [Member]
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Dec. 31, 2012
Marbella RoseGarden, L.L.C. [Member]
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Dec. 31, 2013
RoseGarden Monaco Holdings, L.L.C. [Member]
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Dec. 31, 2012
RoseGarden Monaco Holdings, L.L.C. [Member]
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Dec. 31, 2013
Rosewood Lafayette Holdings, L.L.C. [Member]
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Dec. 31, 2012
Rosewood Lafayette Holdings, L.L.C. [Member]
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Dec. 31, 2012
PruRose Port Imperial South 15, L.L.C. [Member]
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Dec. 31, 2013
Rosewood Morristown, L.L.C. [Member]
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Dec. 31, 2012
Rosewood Morristown, L.L.C. [Member]
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Dec. 31, 2012
Overlook Ridge JV, L.L.C. [Member]
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Dec. 31, 2012
Overlook Ridge JV 2C/3B, L.L.C. [Member]
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Dec. 31, 2013
Roseland/North Retail, L.L.C. [Member]
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Dec. 31, 2012
Roseland/North Retail, L.L.C. [Member]
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Dec. 31, 2013
BNES Associates III [Member]
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Dec. 31, 2012
BNES Associates III [Member]
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Dec. 31, 2013
Portside Master Company, L.L.C. [Member]
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Dec. 31, 2012
Portside Master Company, L.L.C. [Member]
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Dec. 31, 2013
PruRose Port Imperial South 13, L.L.C. [Member]
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Dec. 31, 2012
PruRose Port Imperial South 13, L.L.C. [Member]
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Dec. 31, 2013
Roseland/Port Imperial Partners, L.P. [Member]
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Dec. 31, 2012
Roseland/Port Imperial Partners, L.P. [Member]
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Dec. 31, 2013
RoseGarden Marbella South, L.L.C. [Member]
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Dec. 31, 2012
RoseGarden Marbella South, L.L.C. [Member]
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Dec. 31, 2013
PruRose Riverwalk G, L.L.C. [Member]
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Dec. 31, 2012
PruRose Riverwalk G, L.L.C. [Member]
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Dec. 31, 2013
Elmajo Urban Renewal Associates, L.L.C. [Member]
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Dec. 31, 2012
Elmajo Urban Renewal Associates, L.L.C. [Member]
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Dec. 31, 2013
Estuary Urban Renewal Unit B, LLC [Member]
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Dec. 31, 2012
Estuary Urban Renewal Unit B, LLC [Member]
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Dec. 31, 2013
RiverPark At Harrison I, L.L.C. [Member]
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Dec. 31, 2012
RiverPark At Harrison I, L.L.C. [Member]
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Dec. 31, 2012
150 Main Street, L.L.C. [Member]
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Dec. 31, 2013
RoseGarden Monaco, L.L.C. [Member]
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Dec. 31, 2012
RoseGarden Monaco, L.L.C. [Member]
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Dec. 31, 2013
Hillsborough 206 Holdings, L.L.C. [Member]
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Dec. 31, 2012
Hillsborough 206 Holdings, L.L.C. [Member]
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Dec. 31, 2013
Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]
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Dec. 31, 2012
Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]
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Dec. 31, 2013
Crystal House Apartments Investors LLC [Member]
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Dec. 31, 2013
KPG-P 100 IMW JV, LLC [Member]
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Dec. 31, 2013
Capitol Place Mezz LLC [Member]
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Dec. 23, 2013
Capitol Place Mezz LLC [Member]
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Dec. 31, 2013
Other [Member]
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| Schedule of Equity Method Investments [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Company's investments in unconsolidated joint ventures | $ 181,129,000 | $ 132,339,000 | $ 3,702,000 | $ 4,321,000 | [1] | $ (1,225,000) | $ 4,046,000 | $ 3,876,000 | $ 5,514,000 | $ 12,840,000 | $ 13,012,000 | $ 1,029,000 | $ 36,258,000 | $ 34,006,000 | $ 15,797,000 | $ 16,918,000 | $ 3,201,000 | $ 4,761,000 | $ 857,000 | $ 1,988,000 | $ 606,000 | $ 6,455,000 | $ 7,091,000 | $ 31,000 | $ 179,000 | $ 1,930,000 | $ 2,161,000 | $ 1,753,000 | $ 1,955,000 | $ 3,207,000 | $ 3,651,000 | $ 2,206,000 | $ 2,920,000 | $ 2,068,000 | $ 2,582,000 | $ 7,567,000 | $ 6,182,000 | $ 3,117,000 | $ 4,136,000 | $ 203,000 | $ 629,000 | $ 24,000 | $ 220,000 | $ 3,655,000 | $ 2,606,000 | $ 2,395,000 | [2] | $ 1,224,000 | $ 1,165,000 | $ 1,962,000 | $ 1,967,000 | $ 337,000 | $ 337,000 | $ 26,838,000 | $ 1,887,000 | $ 46,628,000 | $ 46,500,000 | $ 693,000 | |||||
| Accounts payable, accrued expenses and other liabilities | $ 121,286,000 | $ 124,822,000 | $ 1,706,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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