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Investments In Unconsolidated Joint Ventures (Summary Of Company's Investment In Unconsolidated Joint Ventures) (Details) (USD $)
In Thousands, unless otherwise specified
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Mar. 31, 2013
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Dec. 31, 2012
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
$ 158,505
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$ 132,339
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Plaza VIII & IX Associates, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
4,022
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4,321
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South Pier At Harborside [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
(2,487)
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(1,225)
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Red Bank Corporate Plaza, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
3,985
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3,876
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12 Vreeland Associates, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
12,748
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12,840
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Boston Downtown Crossing [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
13,012
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13,012
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Gale Jefferson, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
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1,029
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Stamford SM LLC [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
34,547
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34,006
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Marbella RoseGarden, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
16,601
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16,918
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RoseGarden Monaco Holdings, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
4,363
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4,761
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Rosewood Lafayette Holdings, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
1,698
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1,988
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PruRose Port Imperial South 15, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
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606
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Rosewood Morristown, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
6,935
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7,091
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Overlook Ridge, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
71
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31
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Overlook Ridge JV 2C/3B, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
91
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179
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Roseland/North Retail, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
2,112
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2,161
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BNES Associates III [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
1,839
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1,955
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Portside Master Company, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
3,637
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3,651
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PruRose Port Imperial South 13, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
2,817
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2,920
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Roseland/Port Imperial Partners, L.P. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
2,635
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2,582
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RoseGarden Marbella South, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
6,241
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6,182
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PruRose Riverwalk G, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
3,959
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4,136
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Elmajo Urban Renewal Associates, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
725
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849
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Riverpark At Harrison I, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
2,641
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2,606
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150 Main Street, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
2,602
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2,395
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RoseGarden Monaco, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
1,178
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1,165
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Hillsborough 206 Holdings, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
1,973
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1,967
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Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
337
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337
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Crystal House Apartments Investors LLC [Member]
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| Schedule of Equity Method Investments [Line Items] |
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| Company's investments in unconsolidated joint ventures |
$ 30,223
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