Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Rentals, net	$ 485,829	$ 445,696	$ 418,938
Other	11,896	11,208	13,678
Total	497,725	456,904	432,616
Expenses:
Depreciation and amortization	149,493	129,500	119,933
Operating	98,380	89,902	81,916
Real estate taxes, net	58,502	52,699	50,250
Impairment loss	2,579	9,585	49,671
General and administrative	25,371	28,538	25,461
Total	334,325	310,224	327,231
Operating Income	163,400	146,680	105,385
Interest Expense, net	(97,444)	(106,800)	(130,478)
Interest and Other Income, net	7,685	6,047	5,059
Gain on Sale and Acquisition of Real Estate Joint Venture and Partnership Interests	33,670	14,203	0
Equity in Earnings (Losses) of Real Estate Joint Ventures and Partnerships, net	35,112	(1,558)	7,834
Gain on Acquisition	0	1,869	0
(Provision) Benefit for Income Taxes	(7,051)	70	(2)
Income (Loss) from Continuing Operations	135,372	60,511	(12,202)
Operating Income from Discontinued Operations	9,819	22,287	16,989
Gain on Sale of Property from Discontinued Operations	119,203	68,619	10,648
Income from Discontinued Operations	129,022	90,906	27,637
Gain on Sale of Property	762	1,004	1,304
Net Income	265,156	152,421	16,739
Less: Net Income Attributable to Noncontrolling Interests	(44,894)	(5,781)	(1,118)
Net Income Adjusted for Noncontrolling Interests	220,262	146,640	15,621
Dividends on Preferred Shares	(18,173)	(34,930)	(35,476)
Redemption Costs of Preferred Shares	(17,944)	(2,500)	0
Net Income (Loss) Attributable to Common Shareholders	$ 184,145	$ 109,210	$ (19,855)
Earnings Per Common Share - Basic:
Income (loss) from continuing operations attributable to common shareholders	$ 0.78	$ 0.16	$ (0.38)
Income from discontinued operations	$ 0.74	$ 0.74	$ 0.21
Net income (loss) attributable to common shareholders	$ 1.52	$ 0.90	$ (0.17)
Earnings Per Common Share - Diluted:
Income (loss) from continuing operations attributable to common shareholders	$ 0.77	$ 0.16	$ (0.38)
Income from discontinued operations	$ 0.73	$ 0.74	$ 0.21
Net income (loss) attributable to common shareholders	$ 1.50	$ 0.90	$ (0.17)