Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details)

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Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures $ (3,172) $ (2,423) $ (2,327)
Marbella RoseGarden, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures 231 (19) (540)
RoseGarden Monaco Holdings, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (1,224) (1,040) (1,560)
Rosewood Lafayette Holdings, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (62) (853) (1,131)
PruRose Port Imperial South 15, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures     (606)
Rosewood Morristown, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (364) (345) (509)
Overlook Ridge JV 2C/3B, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (371) (384) 293
PruRose Riverwalk G, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (955) (2,139) (985)
Elmajo Urban Renewal Associates, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures   (203) (345)
Crystal House Apartments Investors LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (123) (139) (2,639)
Portside Master Company, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (1,736) (1,163) (421)
PruRose Port Imperial South 13, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (988) (863) (664)
Roseland/Port Imperial Partners, L.P. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (474) (646) (740)
RoseGarden Marbella South, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures     (57)
Estuary Urban Renewal Unit B, LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures 1 (15) (157)
RiverPark At Harrison I, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (363) (150)  
Capitol Place Mezz LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (3,687) (75)  
Harborside Unit A Urban Renewal, LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures   (218)  
Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (32) (54) (77)
Red Bank Corporate Plaza, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures 392 380 372
12 Vreeland Associates, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures 270 106 74
BNES Associates III [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures 115 240 (14)
Hillsborough 206 Holdings, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (5) (10) (35)
KPG-P 100 IMW JV, LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (800) (1,887) (913)
Keystone-Penn [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures 3,812    
Keystone-TriState [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (2,182) (318)  
KPG-MCG Curtis JV, LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures 475 624  
Plaza VIII & IX Associates, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures 344 320 99
Roseland/North Retail, L.L.C. [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures (70) (102) (230)
South Pier At Harborside [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures 3,036 2,602 2,519
Stamford SM LLC [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures   2,337 3,719
Other [Member]      
Schedule of Equity Method Investments [Line Items]      
Company's equity in earnings (loss) of unconsolidated joint ventures $ 1,588 $ 1,591 $ 2,220