Deferred Financing and Leasing Costs (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred Financing and Leasing Costs [Abstract]
Deferred leasing costs	$ 205,300	$ 185,952
Deferred financing costs	39,942	40,885
In-place lease value and related intangible asset	32,709	26,334
Deferred Costs, Gross	277,951	253,171
Accumulated amortization	(136,706)	(123,557)
Total	$ 141,245	$ 129,614

- 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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