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Intangible Lease Asset/Liability (Narrative) (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Intangible Lease Asset Liability [Abstract]    
Unamortized intangible lease liabilities $ 10,473,000 $ 13,209,000
Unamortized intangible lease assets 400,000 $ 600,000
Accumulated amortization $ 39,600,000