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Basis of presentation and summary of significant accounting policies (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Property, plant and equipment depreciated on a straight-line basis using an estimated life      
Maximum expected period of sale of property (in years) 1 year    
Cost method investment ownership percentage 10.00%   10.00%
Maximum Expected Period for Collection of Receivables 1 year    
Allowance for Doubtful Accounts Receivable $ 0   $ 0
Minimum percentage of taxable income to be distributed 90.00%    
Percent of Taxable Income, Generally Distributed as Dividend 100.00%    
Deferred financing costs – $1.65 billion unsecured senior line of credit $ 13,311,000   14,239,000
Accumulated other comprehensive income 21,460,000   5,355,000
Distributions of earnings from unconsolidated real estate joint ventures 125,000 $ 98,000  
Restricted cash $ 18,320,000   $ 16,334,000
Land improvements | Maximum      
Property, plant and equipment depreciated on a straight-line basis using an estimated life      
Estimated useful life 20 years    
Buildings and building improvements | Maximum      
Property, plant and equipment depreciated on a straight-line basis using an estimated life      
Estimated useful life 40 years