Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets - Carrying Value of Lease Intangible Assets or Liabilities in Other Assets and Other Liabilities (Details)

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Real Estate and Intangible Assets - Carrying Value of Lease Intangible Assets or Liabilities in Other Assets and Other Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Amortization of above-market lease values and deferred revenues $ 10 $ 7 $ 17
Below market lease, period increase (decrease) 63 38 $ 179
Above-market lease values and lease incentives      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets, gross 26 19  
Accumulated amortization (5) (14)  
Below-market lease values and deferred revenue      
Finite-Lived Intangible Assets [Line Items]      
Below market lease, gross (823) (785)  
Below market lease, accumulated amortization 125 61  
Net Below-Market Leases      
Finite-Lived Intangible Assets [Line Items]      
Finite lived intangible assets liabilities gross (797) (766)  
Finite lived intangible assets accumulated amortization and accretion $ 120 $ 47