Condensed Consolidated Statements of Operations and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Rentals, net	$ 127,828	$ 116,013	$ 251,890	$ 227,951
Other	3,749	2,584	6,389	5,262
Total	131,577	118,597	258,279	233,213
Expenses:
Depreciation and amortization	38,190	32,465	76,895	64,731
Operating	25,003	22,906	49,452	44,520
Real estate taxes, net	15,444	13,976	30,104	27,268
Impairment loss	165	2,536	221	9,388
General and administrative	6,194	6,378	12,861	14,685
Total	84,996	78,261	169,533	160,592
Operating Income	46,581	40,336	88,746	72,621
Interest Expense, net	(28,772)	(28,628)	(46,175)	(59,359)
Interest and Other Income, net	2,098	582	3,924	2,968
Gain on Sale of Real Estate Joint Venture and Partnership Interests	83	0	11,592	5,562
Equity in Earnings (Losses) of Real Estate Joint Ventures and Partnerships, net	4,729	(15,695)	9,342	(11,620)
(Provision) Benefit for Income Taxes	(197)	279	(33)	313
Income (Loss) from Continuing Operations	24,522	(3,126)	67,396	10,485
Operating Income from Discontinued Operations	1,379	4,539	3,180	9,492
Gain on Sale of Property from Discontinued Operations	78,012	31,264	78,012	34,898
Income from Discontinued Operations	79,391	35,803	81,192	44,390
Gain on Sale of Property	265	84	407	524
Net Income	104,178	32,761	148,995	55,399
Less: Net Income Attributable to Noncontrolling Interests	(37,742)	(1,342)	(39,209)	(2,783)
Net Income Adjusted for Noncontrolling Interests	66,436	31,419	109,786	52,616
Dividends on Preferred Shares	(5,313)	(8,869)	(12,753)	(17,738)
Redemption Costs of Preferred Shares	(15,702)	0	(17,944)	0
Net Income Attributable to Common Shareholders	45,421	22,550	79,089	34,878
Earnings Per Common Share - Basic:
Income (loss) from continuing operations attributable to common shareholders	$ 0.02	$ (0.10)	$ 0.29	$ (0.07)
Income from discontinued operations	$ 0.35	$ 0.29	$ 0.36	$ 0.36
Net income attributable to common shareholders	$ 0.37	$ 0.19	$ 0.65	$ 0.29
Earnings Per Common Share - Diluted:
Income (loss) from continuing operations attributable to common shareholders	$ 0.02	$ (0.10)	$ 0.29	$ (0.07)
Income from discontinued operations	$ 0.35	$ 0.29	$ 0.36	$ 0.36
Net income attributable to common shareholders	$ 0.37	$ 0.19	$ 0.65	$ 0.29
Comprehensive Income:
Net Income	104,178	32,761	148,995	55,399
Other Comprehensive Income:
Net unrealized gain (loss) on derivatives	9,135	(148)	7,028	(132)
Amortization of loss on derivatives	666	662	1,322	1,321
Retirement liability adjustment	364	0	729	0
Total	10,165	514	9,079	1,189
Comprehensive Income	114,343	33,275	158,074	56,588
Comprehensive Income Attributable to Noncontrolling Interests	(37,742)	(1,342)	(39,209)	(2,783)
Comprehensive Income Adjusted for Noncontrolling Interests	$ 76,601	$ 31,933	$ 118,865	$ 53,805