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Intangible Lease Asset/Liability (Narrative) (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Intangible Lease Asset Liability [Abstract]    
Unamortized intangible lease liabilities $ 13,209,000 $ 17,663,000
Unamortized intangible lease assets 600,000 $ 600,000
Accumulated amortization $ 39,900,000