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Mortgages Payable (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
property
loan
Dec. 31, 2016
USD ($)
property
loan
Debt    
Proceeds from mortgages payable   $ 9,963,000
Mortgage Payable Balance $ 325,941,000 466,045,000
Mortgages Payable    
Debt    
Amount repaid 139,700,000 231,700,000
Assumed mortgages payable   $ 44,100,000
Number of assumed mortgages refinanced | loan   1
Proceeds from mortgages payable   $ 10,000,000
Premium recorded upon acquisition of mortgages   692,000
Remaining balance of deferred financing costs at period end $ 236,000 $ 324,000
Number of mortgages | loan 28 36
Number of Properties | property 62 127
Weighted Average Stated Interest Rate 5.00% 4.90%
Weighted Average Effective Interest Rate (as a percent) 4.40% 4.30%
Weighted Average Remaining Years Until Maturity 4 years 4 years
Remaining Principal Balance $ 320,283,000 $ 460,008,000
Unamortized Premium and Deferred Finance Costs Balance, net 5,658,000 6,037,000
Mortgage Payable Balance $ 325,941,000 $ 466,045,000
Mortgages Payable | Minimum    
Debt    
Weighted Average Effective Interest Rate (as a percent) 2.60% 2.50%
Stated interest rate (as a percent) 3.40% 2.40%
Mortgages Payable | Maximum    
Debt    
Weighted Average Effective Interest Rate (as a percent) 5.50% 8.80%
Stated interest rate (as a percent) 6.90% 6.90%
Mortgages Payable | Mortgages repaid in full    
Debt    
Number of mortgages repaid | loan 8 11
Amount repaid $ 133,500,000 $ 201,800,000
Mortgages Payable | Variable rate mortgages    
Debt    
Number of mortgages | loan 3 6
Number of properties with mortgages | property 3 15
Mortgage Payable Balance $ 29,900,000 $ 76,300,000
Mortgages Payable | Variable rate mortgages after interest rate arrangements    
Debt    
Remaining Principal Balance $ 22,400,000 $ 38,200,000