Other Assets, Net (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Intangible assets:
Finite-Lived Intangible Assets, Net, Total	$ 29,116,000		$ 29,116,000		$ 23,263,000
Other assets:
Accounts receivables, net	114,260,000		114,260,000		123,259,000
Deferred charges, net	50,088,000		50,088,000		44,988,000
Prepaids	12,827,000		12,827,000		11,566,000
Deposits	37,559,000		37,559,000		41,160,000
Other assets	5,560,000		5,560,000		3,473,000
Total other assets, net	249,410,000		249,410,000		247,709,000
Other Assets, Net (Textuals) [Abstract]
Amortization expense	2,000,000	1,700,000	3,500,000	3,400,000
Straight-line rent receivables, net	56,200,000		56,200,000		56,200,000
Leases, Acquired-in-Place [Member]
Intangible assets:
Finite-Lived Intangible Assets, Net, Total	16,288,000		16,288,000		14,228,000
Tenant Relation [Member]
Intangible assets:
Finite-Lived Intangible Assets, Net, Total	$ 12,828,000		$ 12,828,000		$ 9,035,000

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Other assets excluding Intangible assets.

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Other Assets, Net.

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3
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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
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-Paragraph 16

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
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The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable should be reduced by allowances attributable to, for instance, credit risk associated with a lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Technical Bulletin (FTB)
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Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment in the future.

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Aggregate amount of amortization expense recognized for intangible asset during the period. A recognized intangible asset shall be amortized over its estimated useful life to the reporting entity unless that life is determined to be indefinite. If an intangible asset has a finite useful life, but the precise length of that life is not known, that intangible asset shall be amortized over the best estimate of its useful life.

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-Publisher FASB
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-Paragraph 45
-Subparagraph a(2)

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The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. 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.

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-Publisher FASB
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Carrying amount as of the balance sheet date of assets not otherwise specified in the taxonomy. Also serves as the sum of assets not individually reported in the financial statements, or not separately disclosed in notes.

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Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs.

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