Condensed Consolidated Statements Of Income And Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Property revenues
Rental revenues	$ 153,719		$ 135,835
Other property revenues	24,932		21,767
Total property revenues	178,651		157,602
Property expenses
Property operating and maintenance	49,219		44,806
Real estate taxes	18,371		17,344
Total property expenses	67,590		62,150
Non-property income
Fee and asset management	2,923		1,838
Interest and other income (loss)	(688)		4,771
Income on deferred compensation plans	7,786		5,954
Total non-property income	10,021		12,563
Other expenses
Property management	5,284		5,319
Fee and asset management	1,743		1,220
General and administrative	8,679		9,788
Interest	26,683		29,737
Depreciation and amortization	50,118		45,851
Amortization of deferred financing costs	912		1,527
Expense on deferred compensation plans	7,786		5,954
Total other expenses	101,205		99,396
Gain on sale of unconsolidated joint venture interests	0		1,136
Gain on acquisition of controlling interest in joint ventures	40,191		0
Equity in income of joint ventures	366	[1]	374	[1]
Income from continuing operations before income taxes	60,434		10,129
Income tax expense - current	(224)		(1,320)
Income from continuing operations	60,210		8,809
Income from discontinued operations	353		792
Gain on sale of discontinued operations, net of tax	32,541		0
Net income	93,104		9,601
Less income allocated to noncontrolling interests from continuing operations	(825)		(556)
Less income, including gain on sale, allocated to noncontrolling interests from discontinued operations	(670)		(9)
Less income allocated to perpetual preferred units	(776)		(1,750)
Less write off of original issuance costs of redeemed perpetual preferred units	(2,075)		0
Net income attributable to common shareholders	88,758		7,286
Earnings per share - basic
Income from continuing operations attributable to common shareholders	$ 0.70		$ 0.09
Income from discontinued operations, including gain on sale, attributable to common shareholders	$ 0.40		$ 0.01
Net income attributable to common shareholders, as adjusted - per share	$ 1.10		$ 0.10
Earnings per share - diluted
Income from continuing operations attributable to common shareholders	$ 0.68		$ 0.09
Income from discontinued operations, including gain on sale, attributable to common shareholders	$ 0.39		$ 0.01
Net income attributable to common shareholders, as adjusted - per share	$ 1.07		$ 0.10
Distributions declared per common share	$ 0.56		$ 0.49
Weighted average number of common shares outstanding - basic	79,885		71,906
Weighted average number of common shares outstanding - diluted	82,855		72,783
Net income attributable to common shareholders
Income from continuing operations	60,210		8,809
Less income allocated to noncontrolling interests from continuing operations	(825)		(556)
Less income allocated to perpetual preferred units	(776)		(1,750)
Less write off of original issuance costs of redeemed perpetual preferred units	(2,075)		0
Income from continuing operations attributable to common shareholders	56,534		6,503
Income from discontinued operations, including gain on sale	32,894		792
Less income, including gain on sale, allocated to noncontrolling interests from discontinued operations	(670)		(9)
Income from discontinued operations, including gain on sale, attributable to common shareholders	32,224		783
Net income attributable to common shareholders	88,758		7,286
Condensed Consolidated Statements of Comprehensive Income:
Net income	93,104		9,601
Other comprehensive income
Unrealized loss on cash flow hedging activities	0		(503)
Reclassification of net losses on cash flow hedging activities	0		5,766
Reclassification of gain on available-for-sale investment to earnings, net of tax	0		(3,309)
Reclassification of prior service cost on post retirement obligations	8		0
Comprehensive Income	93,112		11,555
Less income allocated to noncontrolling interests from continuing operations	(825)		(556)
Less income, including gain on sale, allocated to noncontrolling interests from discontinued operations	(670)		(9)
Less income allocated to perpetual preferred units	(776)		(1,750)
Less write off of original issuance costs of redeemed perpetual preferred units	(2,075)		0
Comprehensive income attributable to common shareholders	$ 88,766		$ 9,240

[1] Equity in income excludes our ownership interest of fee income from various property management services provided by us to our joint ventures.