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Intangible Lease Asset/Liability (Narrative) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Intangible Lease Asset/Liability [Abstract]    
Unamortized intangible lease liabilities $ 23,776,000us-gaap_OffMarketLeaseUnfavorable $ 26,868,000us-gaap_OffMarketLeaseUnfavorable
Unamortized intangible lease assets 100,000us-gaap_FiniteLivedIntangibleAssetOffMarketLeaseFavorableGross 200,000us-gaap_FiniteLivedIntangibleAssetOffMarketLeaseFavorableGross
Accumulated amortization $ 46,500,000us-gaap_BelowMarketLeaseAccumulatedAmortization