Earnings Per Share (Schedule Of Earnings Per Share) (Details) (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
Earnings Per Share [Abstract]
Income from continuing operations	$ 33,803	$ 33,596	$ 69,645	$ 65,858
Less: Preferred share dividends	(135)	(135)	(271)	(271)
Less: Income from continuing operations attributable to noncontrolling interests	(1,258)	(993)	(2,512)	(2,129)
Less: Earnings allocated to unvested shares	(214)	(208)	(428)	(416)
Income from continuing operations available for common shareholders	32,196	32,260	66,434	63,042
Gain on sale of real estate	4,994	0	4,994	11,860
Net income available for common shareholders, basic and diluted	37,190	32,260	71,428	74,902
Weighted average common shares outstanding-basic	65,149	63,700	64,922	63,556
Stock options	162	180	158	176
Weighted average common shares outstanding-diluted	65,311	63,880	65,080	63,732
Continuing operations	$ 0.49	$ 0.51	$ 1.02	$ 0.99
Gain on Sale of Real Estate per Basic Share	$ 0.08	$ 0.00	$ 0.08	$ 0.19
Earnings Per Share, Basic, Total	$ 0.57	$ 0.51	$ 1.10	$ 1.18
Continuing operations	$ 0.49	$ 0.51	$ 1.02	$ 0.99
Gain on sale of real estate	$ 0.08	$ 0.00	$ 0.08	$ 0.19
Earnings Per Share, Diluted, Total	$ 0.57	$ 0.51	$ 1.10	$ 1.18
Income from continuing operations attributable to the Trust	$ 32,545	$ 32,603	$ 67,133	$ 63,729

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 07-4

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 171

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 40

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 8

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration