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Intangible Assets - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 27.8us-gaap_AmortizationOfIntangibleAssets	$ 21.9us-gaap_AmortizationOfIntangibleAssets
Amortization of direct lease acquisition costs	$ 7.5	$ 7.0
Minimum
Finite-Lived Intangible Assets [Line Items]
Direct lease acquisition costs, useful Life	28 days
Maximum
Finite-Lived Intangible Assets [Line Items]
Direct lease acquisition costs, useful Life	1 year

This element represents the amortization of deferred leasing fees incurred by the lessor and amortized over the term of the lease. Such fees represent (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.

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