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Supplemental Disclosures of Cash Flow Information (Details)
 6 Months Ended
Jun. 30, 2017
USD ($)
building
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Supplemental Disclosures of Cash Flow Information      
Cash paid for interest $ 107,300,000 $ 105,600,000  
Interest capitalized to properties under development 272,000 212,000  
Cash paid for income taxes $ 3,300,000 3,400,000  
Non-cash activities      
Number of buildings damaged | building 2    
Damaged buildings insurance receivables $ 10,731,000   $ 300,000
Loans Assumed   32,500,000  
Net premiums recorded on mortgages assumed   $ 692,000