Deferred Financing and Leasing Costs (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Deferred Financing and Leasing Costs [Abstract]
Deferred leasing costs	$ 187,042	$ 167,712
Deferred financing costs	40,885	42,190
In-place lease value and related intangible asset	26,334	26,778
Deferred Costs, Gross	254,261	236,680
Accumulated amortization	(124,051)	(108,144)
Deferred Financing And Leasing Costs Net Of Accumulated Amortization	$ 130,210	$ 128,536

- Definition

For an unclassified balance sheet, this element represents costs incurred by the lessor that are (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction. This amount is before considering accumulated amortization representing the periodic charge to earnings to recognize the deferred costs over the term of the related lease.

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