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Identified Intangible Assets, Net Identified Intangible Assets, Net (Phantom) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets $ 3,833,000 $ 628,000  
Finite-Lived Intangible Asset, Useful Life 16 years 10 months 24 days   16 years 2 months 12 days
In-Place Leases [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Accumulated Amortization $ 9,350,000   $ 5,832,000
Finite-Lived Intangible Asset, Useful Life 8 years 1 month 6 days   7 years 3 months 18 days
Leasehold Interests [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets $ 24,000 24,000  
Finite-Lived Intangible Assets, Accumulated Amortization $ 144,000   $ 119,000
Finite-Lived Intangible Asset, Useful Life 70 years 3 months 18 days   70 years 7 months 6 days
Above Market Leases [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets $ 38,000 $ 33,000  
Finite-Lived Intangible Assets, Accumulated Amortization $ 211,000   $ 173,000
Finite-Lived Intangible Asset, Useful Life 5 years 4 months 24 days   5 years 7 months 6 days