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Supplemental Disclosures of Cash Flow Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Supplemental Disclosures of Cash Flow Information        
Cash paid for interest $ 240,400,000 $ 214,300,000 $ 229,500,000  
Cash paid for income taxes 3,800,000 3,600,000 3,100,000  
Non-cash activities        
Excess of redemption value over carrying value of preferred shares redeemed 13,373,000      
Notes issued for acquisition of a portfolio of properties 125,900,000      
Loans Assumed   44,100,000    
Net premiums recorded on mortgages assumed   692,000    
Contributions   15,906,000    
Increase in buildings and improvements 15,247,000 13,426,000 11,541,000  
Reconciliation of cash and cash equivalents        
Cash and cash equivalents shown in the consolidated balance sheets 6,898,000 9,420,000    
Impounds related to mortgages payable 4,565,000 2,015,000    
Restricted escrow deposits 679,000 4,246,000    
Total cash, cash equivalents, and restricted cash 12,142,000 15,681,000 50,333,000 $ 46,181,000
Properties under development        
Supplemental Disclosures of Cash Flow Information        
Interest capitalized to properties under development $ 461,000 469,000 $ 594,000  
Non-cash activities        
Increase in buildings and improvements   2,600,000    
Increase in accounts payable   $ 2,600,000