Annual report pursuant to Section 13 and 15(d)

Deferred Costs Schedule of Amortization and Write-Offs of Deferred Financing, Leasing, and Leasing Incentive Costs (Details)

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Deferred Costs Schedule of Amortization and Write-Offs of Deferred Financing, Leasing, and Leasing Incentive Costs (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Deferred financing costs amortization $ 2,851us-gaap_AmortizationOfFinancingCosts $ 2,550us-gaap_AmortizationOfFinancingCosts $ 2,411us-gaap_AmortizationOfFinancingCosts
Deferred leasing costs amortization 4,699us-gaap_AmortizationOfDeferredLeasingFees 4,279us-gaap_AmortizationOfDeferredLeasingFees 3,635us-gaap_AmortizationOfDeferredLeasingFees
Deferred leasing incentives amortization $ 1,704us-gaap_OtherAmortizationOfDeferredCharges $ 980us-gaap_OtherAmortizationOfDeferredCharges $ 675us-gaap_OtherAmortizationOfDeferredCharges