Annual report pursuant to Section 13 and 15(d)

Mortgage Notes Payable and Credit Facility - Mortgage Notes Payable (Details)

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Mortgage Notes Payable and Credit Facility - Mortgage Notes Payable (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Oct. 27, 2017
Sep. 30, 2019
Dec. 31, 2019
USD ($)
property
mortgage
Dec. 31, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
Dec. 27, 2018
property
Debt Instrument [Line Items]            
Debt repaid     $ 57,438 $ 27,850 $ 60,080  
Number of properties acquired | property     18 5    
Weighted Average Interest Rate on Fixed Rate Debt Extended     4.18%      
Variable rate mortgage loans            
Debt Instrument [Line Items]            
Debt repaid     $ 13,600      
Fixed rate mortgage loans            
Debt Instrument [Line Items]            
Debt repaid     $ 31,385      
Stated interest rate (as a percent)     4.55%      
New fixed rate mortgage notes payable            
Debt Instrument [Line Items]            
Aggregate Fixed Rate Debt Issued     $ 69,650      
Stated interest rate (as a percent)     3.90%      
LIBOR            
Debt Instrument [Line Items]            
Weighted Average Interest Rate on Variable Rate Debt Repaid 2.75%          
LIBOR | Variable rate mortgage loans | Weighted Average            
Debt Instrument [Line Items]            
Weighted Average Interest Rate on Variable Rate Debt Repaid     2.47%      
Property Maturing February 8, 2029 | New fixed rate mortgage notes payable            
Debt Instrument [Line Items]            
Aggregate Fixed Rate Debt Issued     $ 10,600      
Number of properties acquired | property           1
Debt instrument term   7 years        
Stated interest rate (as a percent)     4.70%      
Property Maturing February 8, 2029 | LIBOR | Variable rate mortgage loans | Weighted Average            
Debt Instrument [Line Items]            
Weighted Average Interest Rate on Variable Rate Debt Repaid   1.80%        
Property Maturing February 8, 2029 | LIBOR | Fixed rate mortgage loans | Weighted Average            
Debt Instrument [Line Items]            
Weighted Average Interest Rate on Variable Rate Debt Repaid   1.80%        
Property Maturing February 8, 2029 | Treasury Rate | New fixed rate mortgage notes payable            
Debt Instrument [Line Items]            
Debt instrument term     3 years      
Property Maturing June 1, 2024 | New fixed rate mortgage notes payable            
Debt Instrument [Line Items]            
Aggregate Fixed Rate Debt Issued     $ 21,600      
Number of properties acquired | property           1
Stated interest rate (as a percent)     3.42%      
Property Maturing June 18, 2024 | New fixed rate mortgage notes payable            
Debt Instrument [Line Items]            
Aggregate Fixed Rate Debt Issued     $ 8,900      
Stated interest rate (as a percent)     4.35%      
Property Maturing December 10, 2026 | New fixed rate mortgage notes payable            
Debt Instrument [Line Items]            
Aggregate Fixed Rate Debt Issued     $ 4,800      
Stated interest rate (as a percent)     3.97%      
Property Maturing December 17, 2026 | New fixed rate mortgage notes payable            
Debt Instrument [Line Items]            
Aggregate Fixed Rate Debt Issued     $ 4,200      
Stated interest rate (as a percent)     3.97%      
Property Maturing January 1, 2027 | New fixed rate mortgage notes payable            
Debt Instrument [Line Items]            
Aggregate Fixed Rate Debt Issued     $ 19,500      
Stated interest rate (as a percent)     3.75%      
Mortgages | Variable rate mortgage loans debt extended            
Debt Instrument [Line Items]            
Aggregate Variable Rate Debt Extended     $ 12,561      
Debt instrument term     2 years 4 months 10 days      
Number of Long Term Mortgages Maturities Extended | mortgage     2      
Number of Properties that Collateralize Mortgage Notes Payable | property     4      
Mortgages | LIBOR | Variable rate mortgage loans debt extended | Weighted Average            
Debt Instrument [Line Items]            
Weighted Average Interest Rate on Variable Rate Debt Repaid     2.51117%