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Mortgages Payable (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
item
Mar. 31, 2016
USD ($)
item
Dec. 31, 2016
USD ($)
item
Debt instrument      
Assumed mortgages payable $ 0 $ 32,500,000  
Mortgage Payable Balance 463,332,000   $ 466,045,000
Maturity mortgages payable, excluding net premiums      
2017 175,000,000    
2018 350,000,000    
2019 550,000,000    
2021 250,000,000    
Thereafter 3,350,000,000    
Totals $ 4,675,000,000    
Minimum      
Debt instrument      
Weighted Average Stated Interest Rate (as a percent) 2.60%   2.40%
Weighted Average Effective Interest Rate (as a percent) 2.80%   2.50%
Maximum      
Debt instrument      
Weighted Average Stated Interest Rate (as a percent) 6.90%   6.90%
Weighted Average Effective Interest Rate (as a percent) 8.70%   8.80%
Mortgages Payable      
Debt instrument      
Amount repaid $ 2,100,000 164,300,000  
Net premiums recorded upon acquisition of mortgages   692,000  
Remaining balance of deferred financing costs at period end $ 286,000   $ 324,000
Number of Properties | item 127   127
Weighted Average Stated Interest Rate (as a percent) 4.90%   4.90%
Weighted Average Effective Interest Rate (as a percent) 4.30%   4.30%
Weighted Average Remaining Years Until Maturity 3 years 8 months 12 days   4 years
Remaining Principal Balance $ 457,888,000   $ 460,008,000
Unamortized Premium and Deferred Finance Costs Balance, net 5,444,000   6,037,000
Mortgage Payable Balance $ 463,332,000   $ 466,045,000
Number of mortgages | item 36   36
Number of properties with mortgages | item 127   127
Unamortized Premium Balance $ 5,700,000    
Maturity mortgages payable, excluding net premiums      
2017 101,100,000    
2018 21,900,000    
2019 42,300,000    
2020 82,400,000    
2021 66,900,000    
Thereafter 143,300,000    
Totals 457,900,000    
Mortgages repaid in full      
Debt instrument      
Amount repaid   $ 146,700,000  
Number of mortgages repaid | item   7  
Variable rate mortgages      
Debt instrument      
Remaining Principal Balance $ 74,000,000   $ 74,000,000
Number of mortgages | item 6   6
Number of properties with mortgages | item 15   15
Variable rate mortgages after interest rate arrangements      
Debt instrument      
Remaining Principal Balance $ 38,200,000