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Interest rate swap agreements (Details)
$ in Thousands
3 Months Ended 12 Months Ended 24 Months Ended
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Derivative [Line Items]            
Repayments of Debt           $ 942,000
Repayments of Secured Debt     $ 306,199 $ 156,888 $ 396,240  
Outstanding Balance     $ 6,796,440      
Percentage of variable-rate to total debt     6.00%      
Interest rate hedge agreements, notional amount $ 350,000          
Weighted average interest pay rate (as a percent) 2.57%          
Loss recognized related to the early termination of interest rate hedge agreements $ 1,700          
Unsecured Senior Bank Term Loan            
Derivative [Line Items]            
Repayments of Debt $ 350,000          
Secured notes payable maturing on 1/28/20            
Derivative [Line Items]            
Repayments of Secured Debt   $ 193,100        
Commercial paper program            
Derivative [Line Items]            
Commercial paper program issuance balance     $ 750,000      
Outstanding Balance     $ 0      
Maximum | Commercial paper program            
Derivative [Line Items]            
Number of maturity days from date of issuance     397