Condensed Consolidated Statements Of Income And Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Property revenues
Rental revenues	$ 174,303		$ 155,984		$ 510,772		$ 447,728
Other property revenues	27,653		25,779		80,264		72,957
Total property revenues	201,956		181,763		591,036		520,685
Property expenses
Property operating and maintenance	52,109		49,531		151,711		140,662
Real estate taxes	21,618		17,932		64,919		53,085
Total property expenses	73,727		67,463		216,630		193,747
Non-property Income
Fee and asset management	3,096		3,041		8,817		9,572
Interest and other income (loss)	86		3		1,176		(750)
Income (loss) on deferred compensation plans	2,315		(1,781)		5,212		3,820
Total non-property income	5,497		1,263		15,205		12,642
Other expenses
Property management	5,353		5,509		16,578		15,644
Fee and asset management	1,505		1,864		4,468		5,051
General and administrative	9,993		9,303		31,377		27,712
Interest	24,275		25,865		73,967		78,759
Depreciation and amortization	54,880		49,409		160,272		145,709
Amortization of deferred financing costs	875		909		2,689		2,721
Expense (benefit) on deferred compensation plans	2,315		(1,781)		5,212		3,820
Total other expenses	99,196		91,078		294,563		279,416
Gain on sale of land	0		0		698		0
Gain on acquisition of controlling interest in joint ventures	0		0		0		40,191
Equity in income of joint ventures	1,926	[1]	3,688	[1]	20,658	[1]	4,686	[1]
Income from continuing operations before income taxes	36,456		28,173		116,404		105,041
Income tax expense	(720)		(334)		(1,587)		(992)
Income from continuing operations	35,736		27,839		114,817		104,049
Income from discontinued operations	1,656		3,964		5,296		11,164
Gain on sale of discontinued operations, net of tax	34,410		0		91,059		32,541
Net income	71,802		31,803		211,172		147,754
Less income allocated to non-controlling interests from continuing operations	(1,074)		(1,025)		(3,026)		(2,807)
Less income, including gain on sale, allocated to non-controlling interests from discontinued operations	(8)		(75)		(1,778)		(872)
Less income allocated to perpetual preferred units	0		0		0		(776)
Less write off of original issuance costs of redeemed perpetual preferred units	0		0		0		(2,075)
Net income attributable to common shareholders	70,720		30,703		206,368		141,224
Earnings per share - basic
Income from continuing operations attributable to common shareholders	$ 0.39		$ 0.31		$ 1.26		$ 1.17
Income from discontinued operations, including gain on sale, attributable to common shareholders	$ 0.41		$ 0.05		$ 1.09		$ 0.52
Net income attributable to common shareholders, as adjusted - per share	$ 0.80		$ 0.36		$ 2.35		$ 1.69
Earnings per share - diluted
Income from continuing operations attributable to common shareholders	$ 0.39		$ 0.31		$ 1.25		$ 1.16
Income from discontinued operations, including gain on sale, attributable to common shareholders	$ 0.41		$ 0.04		$ 1.09		$ 0.51
Net income attributable to common shareholders, as adjusted - per share	$ 0.80		$ 0.35		$ 2.34		$ 1.67
Distributions declared per common share	$ 0.63		$ 0.56		$ 1.89		$ 1.68
Weighted average number of common shares outstanding - basic	87,449		85,631		87,117		82,923
Weighted average number of common shares outstanding - diluted	87,902		86,293		88,429		84,694
Net income attributable to common shareholders
Income from continuing operations	35,736		27,839		114,817		104,049
Less income allocated to non-controlling interests from continuing operations	(1,074)		(1,025)		(3,026)		(2,807)
Less income allocated to perpetual preferred units	0		0		0		(776)
Less write off of original issuance costs of redeemed perpetual preferred units	0		0		0		(2,075)
Income from continuing operations attributable to common shareholders	34,662		26,814		111,791		98,391
Income from discontinued operations, including gain on sale	36,066		3,964		96,355		43,705
Less income, including gain on sale, allocated to non-controlling interests from discontinued operations	(8)		(75)		(1,778)		(872)
Income from discontinued operations, including gain on sale, attributable to common shareholders	36,058		3,889		94,577		42,833
Net income attributable to common shareholders	70,720		30,703		206,368		141,224
Condensed Consolidated Statements of Comprehensive Income:
Net income	71,802		31,803		211,172		147,754
Other comprehensive income
Reclassification of prior service cost and net loss on post retirement obligations	14		7		41		23
Comprehensive income	71,816		31,810		211,213		147,777
Less income allocated to non-controlling interests from continuing operations	(1,074)		(1,025)		(3,026)		(2,807)
Less income, including gain on sale, allocated to non-controlling interests from discontinued operations	(8)		(75)		(1,778)		(872)
Less income allocated to perpetual preferred units	0		0		0		(776)
Less write off of original issuance costs of redeemed perpetual preferred units	0		0		0		(2,075)
Comprehensive income attributable to common shareholders	$ 70,734		$ 30,710		$ 206,409		$ 141,247

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