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Basis of Presentation and Summary of Significant Accounting Policies (Deferred Leasing Costs) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Deferred Leasing Costs [Member]
Accumulated amortization	$ 165,904	$ 150,702
Acquired Above Market Leases [Member]
Accumulated amortization	17,408	12,572
Acquired Below Market Leases [Member]
Accumulated amortization	32,954	32,193
Lease Incentives [Member]
Accumulated amortization	$ 6,768	$ 5,698

For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income.

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