Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:
Rentals, net	$ 127,974	$ 120,361	$ 380,398	$ 353,880
Other	2,547	2,941	7,906	9,244
Total	130,521	123,302	388,304	363,124
Expenses:
Depreciation and amortization	36,694	35,348	113,948	107,039
Operating	23,454	24,430	71,989	70,962
Real estate taxes, net	15,412	14,717	46,419	42,696
Impairment loss	0	2,358	0	2,579
General and administrative	6,146	5,964	17,879	18,812
Total	81,706	82,817	250,235	242,088
Operating Income	48,815	40,485	138,069	121,036
Interest Expense, net	(24,373)	(26,018)	(73,263)	(68,482)
Interest and Other Income, net	96	1,864	2,893	5,787
Gain on Sale and Acquisition of Real Estate Joint Venture and Partnership Interests	0	7	1,718	11,599
Equity in Earnings of Real Estate Joint Ventures and Partnerships, net	7,881	5,125	16,331	14,467
Benefit for Income Taxes	284	226	1,885	256
Income from Continuing Operations	32,703	21,689	87,633	84,663
Operating Income from Discontinued Operations	0	2,323	342	9,925
Gain on Sale of Property from Discontinued Operations	0	38,214	44,582	116,226
Income from Discontinued Operations	0	40,537	44,924	126,151
Gain on Sale of Property	69,496	163	71,407	570
Net Income	102,199	62,389	203,964	211,384
Less: Net Income Attributable to Noncontrolling Interests	(1,870)	(1,847)	(4,936)	(41,056)
Net Income Adjusted for Noncontrolling Interests	100,329	60,542	199,028	170,328
Dividends on Preferred Shares	(2,710)	(2,710)	(8,130)	(15,463)
Redemption Costs of Preferred Shares	0	0	0	(17,944)
Net Income Attributable to Common Shareholders	$ 97,619	$ 57,832	$ 190,898	$ 136,921
Earnings Per Common Share - Basic:
Income from continuing operations attributable to common shareholders	$ 0.80	$ 0.14	$ 1.20	$ 0.40
Income from discontinued operations	$ 0.00	$ 0.34	$ 0.37	$ 0.73
Net income attributable to common shareholders	$ 0.80	$ 0.48	$ 1.57	$ 1.13
Earnings Per Common Share - Diluted:
Income from continuing operations attributable to common shareholders	$ 0.79	$ 0.14	$ 1.19	$ 0.39
Income from discontinued operations	$ 0.00	$ 0.33	$ 0.36	$ 0.73
Net income attributable to common shareholders	$ 0.79	$ 0.47	$ 1.55	$ 1.12