Related Party Transactions - Related Party Loans Payable (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Property
loan
Affiliated Entity | Mortgage Loans Payable  
Related Party Transaction [Line Items]  
Interest expense on note payable $ 167
Related party notes payable  
Related Party Transaction [Line Items]  
Outstanding principal of related parties notes payable $ 27,890
Related party notes payable | Affiliated Entity | Mortgage Loans Payable  
Related Party Transaction [Line Items]  
Number of mortgage loans with related party | loan 4
Number of properties with related party | Property 6
Outstanding principal of related parties notes payable $ 27,900
Weighted Average  
Related Party Transaction [Line Items]  
Weighted average effective interest rates 5.26%
Weighted average remaining term 2 years 11 months
Weighted Average | Related party notes payable  
Related Party Transaction [Line Items]  
Weighted average effective interest rates 1.00%
Weighted average remaining term 9 years 2 months
Weighted Average | Related party notes payable | Affiliated Entity | Mortgage Loans Payable  
Related Party Transaction [Line Items]  
Weighted average effective interest rates 1.00%
Weighted average remaining term 9 years 2 months