Commitments and Contingencies (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013 Number	Jun. 30, 2012	Jun. 30, 2013 Number	Jun. 30, 2012	Dec. 31, 2012
Commitments and Contingencies (Textual) [Abstract]
Number of outstanding letters of credit	7		7
Letter of credit obligation	$ 5,957		$ 5,957
Outstanding construction financings for leased properties	137,481		137,481		162,984
Additional financing to complete construction	241,004		241,004
Total contingent purchase obligations	62,448		62,448
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	710,597		710,597
Rental expense related to company office space	429	312	842	601
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals	45,869		45,869
Capital Leases, Future Minimum Payments Due	$ 81,451		$ 81,451

Additional financing to complete construction.

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Number of outstanding letters of credit.

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- Definition

Amount of minimum lease payments for capital leases.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

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The current amount of expenditures for a real estate project that has not yet been completed.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

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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

No definition available.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Contractually required future rental payments receivable on noncancelable subleasing arrangements.

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-Name Accounting Standards Codification

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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