Consolidated Statements Of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Rentals, net	$ 502,464	$ 503,128	$ 477,340
Other	10,380	11,278	11,855
Total	512,844	514,406	489,195
Expenses:
Depreciation and amortization	145,940	150,356	146,763
Operating	94,244	95,318	97,099
Real estate taxes, net	60,289	60,768	57,515
Impairment loss	153	1,024	2,579
General and administrative	27,524	24,902	25,371
Total	328,150	332,368	329,327
Operating Income	184,694	182,038	159,868
Interest Expense, net	(87,783)	(94,725)	(96,312)
Interest and Other Income, net	4,563	3,756	7,685
Gain on Sale and Acquisition of Real Estate Joint Venture and Partnership Interests	879	1,718	33,670
Equity in Earnings of Real Estate Joint Ventures and Partnerships, net	19,300	22,317	35,112
(Provision) Benefit for Income Taxes	(52)	1,261	(7,046)
Income from Continuing Operations	121,601	116,365	132,977
Operating Income from Discontinued Operations	0	342	12,214
Gain on Sale of Property from Discontinued Operations	0	44,582	119,203
Income from Discontinued Operations	0	44,924	131,417
Gain on Sale of Property	59,621	146,290	762
Net Income	181,222	307,579	265,156
Less: Net Income Attributable to Noncontrolling Interests	(6,870)	(19,571)	(44,894)
Net Income Adjusted for Noncontrolling Interests	174,352	288,008	220,262
Dividends on Preferred Shares	(3,830)	(10,840)	(18,173)
Redemption Costs of Preferred Shares	(9,687)	0	(17,944)
Net Income Attributable to Common Shareholders	$ 160,835	$ 277,168	$ 184,145
Earnings Per Common Share - Basic:
Income from continuing operations attributable to common shareholders (in dollars per share)	$ 1.31	$ 1.91	$ 0.76
Income from discontinued operations (in dollars per share)	0.00	0.37	0.76
Net income attributable to common shareholders (in dollars per share)	1.31	2.28	1.52
Earnings Per Common Share - Diluted:
Income from continuing operations attributable to common shareholders (in dollars per share)	1.29	1.89	0.75
Income from discontinued operations (in dollars per share)	0.00	0.36	0.75
Net income attributable to common shareholders (in dollars per share)	$ 1.29	$ 2.25	$ 1.50