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Summary of significant accounting policies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
property
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2020
USD ($)
Accounting policies        
Maximum expected period of sale of property (in years) 1 year      
Cost method investment ownership percentage 10.00%      
Percentage of total revenues 98.60%      
Revenue with customer, asset, adjustment to allowance for credit loss $ 4,900      
Contract with customer, asset, allowance for credit loss, current 3,000      
Contract with customer, asset, allowance for credit loss 6,800      
Direct financing lease, net investment in lease, allowance for credit loss 2,800     $ 2,200
Credit loss related to trade receivables $ 259      
Minimum percentage of taxable income to be distributed 90.00%      
Percent of taxable income, generally distributed as dividend 100.00%      
Income from rentals        
Operating leases $ 2,081,362 $ 1,854,427 $ 1,465,692  
Direct financing and sales-type leases 3,489 2,469 2,421  
Income from rentals 2,114,150 1,885,637 1,531,296  
Revenues subject to the lease accounting standard 2,084,851 1,856,896 1,468,113  
Income from rentals        
Income from rentals        
Income from rentals 2,108,249 1,878,208 1,516,864  
Income from rentals | Cumulative Effect, Period of Adoption, Adjustment        
Income from rentals        
Revenues subject to the revenue recognition accounting standard 23,398 21,312 48,751  
Other income        
Income from rentals        
Income from rentals $ 5,901 7,429 $ 14,432  
Revenues subject to other accounting guidance        
Accounting policies        
Percentage of total revenues 1.40%      
Income from rentals        
Income from rentals $ 29,300      
Canada        
Accounting policies        
Number of real estate properties | property 6      
China        
Accounting policies        
Number of real estate properties | property 1      
Accounting Standards Update 2014-09 - Revenue from Contract with Customers        
Accounting policies        
Receivables from revenue transactions within scope of revenue recognition $ 16,100      
Accounting Standards Update 2014-09 - Revenue from Contract with Customers | Income from rentals        
Income from rentals        
Revenues subject to the revenue recognition accounting standard $ 23,400 $ 21,300    
Maximum | Buildings and building improvements        
Accounting policies        
Estimated useful life 40 years      
Maximum | Land improvements        
Accounting policies        
Estimated useful life 20 years