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Identified Intangible Assets, Net Identified Intangible Assets, Net (Phantom) (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]          
Amortization of Intangible Assets $ 4,124,000 $ 859,000 $ 7,957,000 $ 1,487,000  
Finite-Lived Intangible Asset, Useful Life     16 years 7 months 6 days   16 years 2 months 12 days
In-Place Leases [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-Lived Intangible Assets, Accumulated Amortization 12,973,000   $ 12,973,000   $ 5,832,000
Finite-Lived Intangible Asset, Useful Life     8 years 2 months 12 days   7 years 3 months 18 days
Leasehold Interests [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortization of Intangible Assets 25,000 25,000 $ 49,000 49,000  
Finite-Lived Intangible Assets, Accumulated Amortization 168,000   $ 168,000   $ 119,000
Finite-Lived Intangible Asset, Useful Life     70 years 1 month 6 days   70 years 7 months 6 days
Above Market Leases [Member]          
Finite-Lived Intangible Assets [Line Items]          
Amortization of Intangible Assets 39,000 $ 33,000 $ 77,000 $ 66,000  
Finite-Lived Intangible Assets, Accumulated Amortization $ 230,000   $ 230,000   $ 173,000
Finite-Lived Intangible Asset, Useful Life     5 years 1 month 6 days   5 years 7 months 6 days