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Supplemental Disclosures of Cash Flow Information (Details) - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Supplemental Disclosures of Cash Flow Information    
Cash paid for interest $ 190,800,000 $ 201,400,000
Interest capitalized to properties under development 344,000 463,000
Cash paid for income taxes 3,600,000 3,100,000
Non-cash investing and financing activities    
Loans Assumed 32,500,000 $ 0
Net premiums recorded on mortgages assumed 692,000  
Increase in buildings and improvements and accounts payable $ 1,500,000