Real Estate Intangibles (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2010	Dec. 31, 2009
Assets
Other Finite-Lived Intangible Assets, Gross	$ 258,079	$ 127,390
Accumulated amortization	(49,145)	(29,698)
Net book value	208,934	97,692
Weighted-average amortization period in years	18.2	30
Liabilities
Real estate intangible liabilities, Gross	62,281	27,045
Accumulated amortization	(15,992)	(10,478)
Net book value	46,289	16,567
Weighted-average amortization period in years	14.0	12.1
In place lease intangibles [Member]
Assets
Other Finite-Lived Intangible Assets, Gross	182,030	74,198
Above market tenant leases [Member]
Assets
Other Finite-Lived Intangible Assets, Gross	24,089	10,232
Below market ground leases [Member]
Assets
Other Finite-Lived Intangible Assets, Gross	46,992	39,806
Lease commissions [Member]
Assets
Other Finite-Lived Intangible Assets, Gross	4,968	3,154
Gross historical cost [Member]
Assets
Other Finite-Lived Intangible Assets, Gross	258,079	127,390
Below market tenant leases [Member]
Liabilities
Real estate intangible liabilities, Gross	57,261	22,961
Above market ground leases [Member]
Liabilities
Real estate intangible liabilities, Gross	$ 5,020	$ 4,084

Other Finite Lived Intangible Assets Accumulated Amortization.

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- Definition

Real Estate Intangible Liabilities Accumulated Amortization.

+ Details

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- Definition

Real Estate Intangible Liabilities Gross.

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- Definition

Real Estate Intangible Liabilities Net.

+ Details

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- Definition

Real Estate Intangible Liabilities Weighted Average Useful Life.

+ Details

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- Definition

The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 44
-Subparagraph a(1)

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- Definition

The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 44
-Subparagraph a(3)

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- Definition

Gross carrying amount before accumulated amortization as of the balance sheet date of intangible assets not otherwise specified in the taxonomy having a reasonably expected period of economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a

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