Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (Summary Of The Results Of Operations) (Details)

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Investments In Unconsolidated Joint Ventures (Summary Of The Results Of Operations) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule of Equity Method Investments [Line Items]                      
Total revenues                 $ 51,317 $ 76,862 $ 84,071
Operating and other                 (32,090) (39,542) (57,161)
Depreciation and amortization                 (10,593) (15,110) (21,669)
Interest expense                 (6,743) (9,182) (14,581)
Net income                 1,891 13,028 (9,340)
Company's equity in earnings (loss) of unconsolidated joint ventures 848 539 736 (101) 2,063 475 260 (522) 2,022 2,276 (5,560)
Plaza VIII & IX Associates [Member]
                      
Schedule of Equity Method Investments [Line Items]                      
Total revenues                 963 798 804
Operating and other                 (214) (206) (192)
Depreciation and amortization                 (613) (612) (612)
Net income                 136 (20)  
Company's equity in earnings (loss) of unconsolidated joint ventures                 68 (10)  
Harborside South Pier [Member]
                      
Schedule of Equity Method Investments [Line Items]                      
Total revenues                 38,428 34,680 35,002
Operating and other                 (25,521) (24,206) (23,170)
Depreciation and amortization                 (5,664) (5,067) (4,215)
Interest expense                 (4,464) (4,449) (4,592)
Net income                 2,779 958 3,025
Company's equity in earnings (loss) of unconsolidated joint ventures                 1,495 301 2,856
Red Bank Corporate Plaza [Member]
                      
Schedule of Equity Method Investments [Line Items]                      
Total revenues                 3,257 4,325 3,214
Operating and other                 (902) (1,028) (1,002)
Depreciation and amortization                 (903) (901) (871)
Interest expense                 (560) (335) (340)
Net income                 892 2,061 1,001
Company's equity in earnings (loss) of unconsolidated joint ventures                 446 649 463
M-G-G [Member]
                      
Schedule of Equity Method Investments [Line Items]                      
Total revenues                      17,582
Operating and other                      (7,076)
Depreciation and amortization                      (6,493)
Interest expense                      (4,883)
Net income                      (870)
Company's equity in earnings (loss) of unconsolidated joint ventures                      (916)
Gramercy Agreement [Member]
                      
Schedule of Equity Method Investments [Line Items]                      
Total revenues                 6,141 17,802 7,902
Operating and other                 (3,821) (5,793) (4,675)
Depreciation and amortization                 (2,230) (3,965) (3,073)
Interest expense                 (1,559) (2,485) (1,862)
Net income                 (1,469) 5,559 (1,708)
Princeton Forrestal Village [Member]
                      
Schedule of Equity Method Investments [Line Items]                      
Total revenues                   11,677 13,171
Operating and other                   (6,614) (7,558)
Depreciation and amortization                   (3,154) (3,948)
Interest expense                   (1,620) (1,788)
Net income                   289 (123)
Company's equity in earnings (loss) of unconsolidated joint ventures                   (379) (131)
Route 93 Portfolio [Member]
                      
Schedule of Equity Method Investments [Line Items]                      
Total revenues                      2,153
Operating and other                      (2,487)
Depreciation and amortization                      (1,206)
Interest expense                      (649)
Net income                      (2,189)
Company's equity in earnings (loss) of unconsolidated joint ventures                      (4,354)
Gale Kimball [Member]
                      
Schedule of Equity Method Investments [Line Items]                      
Total revenues                   5,194 1,664
Net income                   5,194 1,664
Company's equity in earnings (loss) of unconsolidated joint ventures                   1,909 648
12 Vreeland [Member]
                      
Schedule of Equity Method Investments [Line Items]                      
Total revenues                 2,250 2,386 2,579
Operating and other                 (159) (161) (62)
Depreciation and amortization                 (1,183) (1,411) (1,251)
Interest expense                 (160) (293) (467)
Net income                 748 521 799
Company's equity in earnings (loss) of unconsolidated joint ventures                 374 260 400
Boston-Downtown Crossing [Member]
                      
Schedule of Equity Method Investments [Line Items]                      
Operating and other                 (1,473) (1,446) (10,881)
Net income                 (1,473) (1,446) (10,881)
Company's equity in earnings (loss) of unconsolidated joint ventures                 (448) (437) (4,500)
Gale Jefferson [Member]
                      
Schedule of Equity Method Investments [Line Items]                      
Total revenues                 278    
Operating and other                   (88) (58)
Net income                 278 (88) (58)
Company's equity in earnings (loss) of unconsolidated joint ventures                 $ 87 $ (17) $ (26)