Condensed Consolidated Statements Of Income And Comprehensive Income (USD $) In Thousands, except Per Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Property revenues
Rental revenues	$ 144,211		$ 131,911		$ 424,210		$ 390,376
Other property revenues	24,723		22,363		70,977		64,641
Total property revenues	168,934		154,274		495,187		455,017
Property expenses
Property operating and maintenance	50,715		46,999		144,666		134,655
Real estate taxes	17,329		16,652		52,932		52,767
Total property expenses	68,044		63,651		197,598		187,422
Non-property income (loss)
Fee and asset management	2,646		2,145		6,955		6,028
Interest and other income (loss)	(108)		451		4,749		3,988
Income (loss) on deferred compensation plans	(6,096)		6,918		1,233		6,818
Total non-property income (loss)	(3,558)		9,514		12,937		16,834
Other expenses
Property management	5,050		4,789		15,478		14,994
Fee and asset management	1,330		1,155		4,220		3,611
General and administrative	8,572		7,568		26,392		22,339
Interest	27,354		31,781		85,472		95,078
Depreciation and amortization	44,558		43,034		137,111		128,012
Amortization of deferred financing costs	1,344		1,185		4,761		2,624
Expense (benefit) on deferred compensation plans	(6,096)		6,918		1,233		6,818
Total other expenses	82,112		96,430		274,667		273,476
Loss on discontinuation of hedging relationship					(29,791)
Gain on sale of properties, including land					4,748		236
Gain on sale of unconsolidated joint venture interests					1,136
Equity in loss of joint ventures	(556)	[1]	(244)	[1]	(166)	[1]	(785)	[1]
Income from continuing operations before income taxes	14,664		3,463		11,786		10,404
Income tax expense - current	(313)		(712)		(1,889)		(1,286)
Income from continuing operations	14,351		2,751		9,897		9,118
Income from discontinued operations			1,081				2,743
Net income	14,351		3,832		9,897		11,861
Less income allocated to noncontrolling interests from continuing operations	(761)		(432)		(2,118)		(542)
Less income allocated to perpetual preferred units	(1,750)		(1,750)		(5,250)		(5,250)
Net income attributable to common shareholders	11,840		1,650		2,529		6,069
Earnings per share - basic
Income from continuing operations attributable to common shareholders	$ 0.16		$ 0.01		$ 0.03		$ 0.05
Income from discontinued operations attributable to common shareholders			$ 0.01				$ 0.04
Net income attributable to common shareholders	$ 0.16		$ 0.02		$ 0.03		$ 0.09
Earnings per share - diluted
Income from continuing operations attributable to common shareholders	$ 0.16		$ 0.01		$ 0.03		$ 0.05
Income from discontinued operations attributable to common shareholders			$ 0.01				$ 0.04
Net income attributable to common shareholders	$ 0.16		$ 0.02		$ 0.03		$ 0.09
Distributions declared per common share	$ 0.49		$ 0.45		$ 1.47		$ 1.35
Weighted average number of common shares outstanding - basic	73,242		69,100		72,502		67,898
Weighted average number of common shares outstanding - diluted	74,274		69,441		73,217		68,169
Net income attributable to common shareholders
Income from continuing operations	14,351		2,751		9,897		9,118
Less income allocated to noncontrolling interests from continuing operations	(761)		(432)		(2,118)		(542)
Less income allocated to perpetual preferred units	(1,750)		(1,750)		(5,250)		(5,250)
Income from continuing operations attributable to common shareholders	11,840		569		2,529		3,326
Income from discontinued operations attributable to common shareholders			1,081				2,743
Net income attributable to common shareholders	11,840		1,650		2,529		6,069
Condensed Consolidated Statements of Comprehensive Income:
Net income	14,351		3,832		9,897		11,861
Other comprehensive income
Unrealized loss on cash flow hedging activities			(5,323)		(2,692)		(19,549)
Reclassification of net losses on cash flow hedging activities	108		5,825		39,660		17,488
Unrealized gain on available-for-sale securities, net of tax			1,914				1,914
Reclassification of gain on available-for-sale investment to earnings, net of tax					(3,309)
Comprehensive income	14,459		6,248		43,556		11,714
Less income allocated to noncontrolling interests from continuing operations	(761)		(432)		(2,118)		(542)
Less income allocated to perpetual preferred units	(1,750)		(1,750)		(5,250)		(5,250)
Comprehensive income attributable to common shareholders	$ 11,948		$ 4,066		$ 36,188		$ 5,922

[1] Equity in income (loss) excludes our ownership interest of fee income from various property management services with our joint ventures.