Commitments and Contingencies (Details Textual) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Jun. 30, 2011
Commitments and Contingencies (Textual) [Abstract]
Number of outstanding letters of credit			4
Letter of credit obligation	$ 5,415,000		$ 5,415,000
Gross assets under capital lease recorded in real property	181,254,000		181,254,000
Outstanding construction financings for leased properties	208,257,000		208,257,000
Additional financing to complete construction	256,693,000		256,693,000
Total contingent purchase obligations	69,641,000		69,641,000
Minimum part of economic life of the leased asset to be classified as capital lease			75.00%
Minimum net present value of the future minimum lease payments to be classified as capital lease.	90.00%		90.00%
Operating lease obligations relating to certain ground leases	261,483,000		261,483,000		261,483,000
Rental expense related to company office space	341,000	303,000	1,472,000	938,000
Aggregated future minimum rentals to be received	$ 30,251,000		$ 30,251,000

Additional financing to complete construction.

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- Definition

Commitments and contingencies.

+ Details

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- Definition

Contingent purchase obligations.

+ Details

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Balance Type:	debit
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- Definition

Letter of credit obligation

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Minimum net present value of the future minimum lease payments to be classified as capital lease.

+ Details

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- Definition

Minimum part of economic life of the leased asset to be classified as capital lease.

+ Details

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- Definition

Number of outstanding letters of credit.

+ Details

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- Definition

Outstanding construction financings for leased properties

+ Details

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- Definition

The total gross amount of assets subject to a lease meeting the criteria for capitalization.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 1, 10, 13

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph a(i)

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- Definition

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 15

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph c

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- Definition

The total of future contractually required payments on leases defined as operating.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 122

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph b(i)

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- Definition

Contractually required future rental payments receivable on noncancelable subleasing arrangements.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph b(ii)

+ Details

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