Quarterly report pursuant to Section 13 or 15(d)

Property Portfolio (summary of the acquired lease intangible amortization) (Details)

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Property Portfolio (summary of the acquired lease intangible amortization) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Leases, Acquired-in-Place [Member]        
Property, Plant and Equipment [Line Items]        
Finite-Lived Intangible Assets, Accumulated Amortization $ 629 $ 353 $ 1,150 $ 634
Lease Costs [Member]        
Property, Plant and Equipment [Line Items]        
Finite-Lived Intangible Assets, Accumulated Amortization 297 106 541 169
Above Market Leases [Member]        
Property, Plant and Equipment [Line Items]        
Finite-Lived Intangible Assets, Accumulated Amortization 229 14 380 18
Below Market Lease [Member]        
Property, Plant and Equipment [Line Items]        
Finite-Lived Intangible Assets, Accumulated Amortization 54 19 96 31
market ground lease [Member]        
Property, Plant and Equipment [Line Items]        
Finite-Lived Intangible Assets, Accumulated Amortization $ 6 $ 2 $ 10 $ 2