Annual report pursuant to Section 13 and 15(d)

Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility - Mortgage Notes Payable (Details)

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Mortgage Notes Payable, Revolving Credit Facility, and Term Loan Facility - Mortgage Notes Payable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 27, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Debt repaid   $ 60,080 $ 88,899 $ 66,714
Weighted average interest rate on debt outstanding (as percent)   4.42%    
Proceeds from debt issuance   $ 51,208 $ 78,705 $ 68,499
Fixed rate mortgage loans        
Debt Instrument [Line Items]        
Debt repaid   $ 41,077    
Weighted average interest rate on debt outstanding (as percent)   6.25%    
Variable rate mortgage loans        
Debt Instrument [Line Items]        
Debt repaid   $ 8,163    
New Fixed Rate Mortgage Notes Payable        
Debt Instrument [Line Items]        
Weighted average interest rate on debt outstanding (as percent)   3.78%    
Proceeds from debt issuance   $ 54,887    
New Variable Rate Mortgage Notes Payable        
Debt Instrument [Line Items]        
Proceeds from debt issuance   $ 7,500    
London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Libor rate (as percent) 2.75% 1.56%    
London Interbank Offered Rate (LIBOR) | Variable rate mortgage loans | Weighted Average        
Debt Instrument [Line Items]        
Libor rate (as percent)   2.50%