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Summary of significant accounting policies (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
property
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
property
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
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%   10.00%
Reclassification of cumulative net unrealized gains on non-real estate investments     $ 90,750,000    
Maximum Expected Period for Collection of Receivables     1 year    
Allowance for Doubtful Accounts Receivable $ 0   $ 0   $ 0
Minimum percentage of taxable income to be distributed     90.00%    
Percent of Taxable Income, Generally Distributed as Dividend     100.00%    
Revenues          
Revenue $ 325,034,000 $ 273,059,000 $ 645,173,000 $ 543,936,000  
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    
Canada          
Property, plant and equipment depreciated on a straight-line basis using an estimated life          
Number of Real Estate Properties | property 3   3    
China          
Property, plant and equipment depreciated on a straight-line basis using an estimated life          
Number of Real Estate Properties | property 1   1    
Accumulated Other Comprehensive Income          
Property, plant and equipment depreciated on a straight-line basis using an estimated life          
Reclassification of cumulative net unrealized gains on non-real estate investments     $ (49,771,000)    
Rental revenues          
Revenues          
Revenue $ 250,635,000 211,942,000 495,120,000 419,135,000  
Tenant recoveries          
Revenues          
Revenue 72,159,000 60,470,000 145,329,000 121,816,000  
Other income          
Revenues          
Revenue 2,240,000 $ 647,000 4,724,000 $ 2,985,000  
Accounting Standards Update 2014-09 - Revenue from Contract with Customers          
Revenues          
Revenue subject to the ASU on recognition of revenue arising from contracts with customers 13,582,000   26,035,000    
Accounting Standards Update 2014-09 - Revenue from Contract with Customers | Rental revenues          
Revenues          
Revenue subject to the ASU on recognition of revenue arising from contracts with customers 12,086,000   22,519,000    
Accounting Standards Update 2014-09 - Revenue from Contract with Customers | Tenant recoveries          
Revenues          
Revenue subject to the ASU on recognition of revenue arising from contracts with customers 0   0    
Accounting Standards Update 2014-09 - Revenue from Contract with Customers | Other income          
Revenues          
Revenue subject to the ASU on recognition of revenue arising from contracts with customers 1,496,000   3,516,000    
Other accounting standards update          
Revenues          
Revenues subject to new accounting pronouncements 311,452,000   619,138,000    
Other accounting standards update | Rental revenues          
Revenues          
Revenues subject to new accounting pronouncements 238,549,000   472,601,000    
Other accounting standards update | Tenant recoveries          
Revenues          
Revenues subject to new accounting pronouncements 72,159,000   145,329,000    
Other accounting standards update | Other income          
Revenues          
Revenues subject to new accounting pronouncements $ 744,000   $ 1,208,000