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Supplemental Disclosures of Cash Flow Information (Details)
3 Months Ended
Mar. 31, 2017
USD ($)
building
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Supplemental Disclosures of Cash Flow Information      
Cash paid for interest $ 75,600,000 $ 84,100,000  
Interest capitalized to properties under development 190,000 126,000  
Cash paid for income taxes $ 2,500,000 1,600,000  
Non-cash activities      
Number of buildings damaged | building 2    
Insurance proceeds receivable $ 10,641,000   $ 300,000
Loans Assumed   32,500,000  
Net premiums recorded on mortgages assumed   $ 692,000