Annual report pursuant to Section 13 and 15(d)

Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Income From Continuing Operations) (Details)

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Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Income From Continuing Operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting [Abstract]                      
Net operating income [1]                 $ 166,560 $ 149,615 $ 204,089
Depreciation and amortization $ (43,136) $ (44,099) $ (42,365) $ (40,802) $ (40,811) $ (41,983) $ (44,711) $ (44,985) (170,402) (172,490) (182,766)
Realized gains (losses) on disposition of rental property, net   18,718 34,399 144   264 54,584   53,261 54,848  
Gain on sale of investment in unconsolidated joint ventures     6,448           6,448    
Loss from early extinguishment of debt         (582)         (582) (156)
Impairments (33,743) [2] (164,176) [2]             (197,919)   (110,853)
Income (loss) from continuing operations                 (142,052) 31,391 (89,686)
Income from discontinued operations                     11,811
Loss from early extinguishment of debt                     (703)
Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net                     59,520
Total discontinued operations, net                     70,628
Net income (loss) (35,975) (142,141) 39,389 (3,325) (10,413) 2,085 57,347 (17,628) (142,052) 31,391 (19,058)
Noncontrolling interest in consolidated joint ventures 462 (281) 373 490         1,044 778 2,199
Noncontrolling interest in Operating Partnership 3,795 15,530 (4,383) 314 1,152 (248) (6,514) 2,008 15,256 (3,602) 10,459
Noncontrolling interest in discontinued operations                     (8,509)
Net income (loss) available to common shareholders $ (31,718) $ (126,892) $ 35,379 $ (2,521) $ (9,240) $ 1,982 $ 51,123 $ (15,298) $ (125,752) $ 28,567 $ (14,909)
[1] Net operating income represents total revenues less total operating and interest expenses (as defined in Note "a"), plus equity in earnings (loss) of unconsolidated joint ventures, for the period.
[2] Amounts for the year ended December 31, 2015 relate to impairment charges as further described in Note 3: Recent Transactions - Impairments on Properties Held and Used.