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Interest rate hedge agreements (Details)
$ in Thousands
3 Months Ended 9 Months Ended 30 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Derivative [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Amount, Net $ 343,000 $ 343,000  
Percentage of unhedged floating rate total debt 5.00% 5.00%  
Repayments of Libor-based debt     $ 1,100,000
Interest rate hedge agreements, notional amount $ 350,000 $ 350,000  
Weighted-average interest pay rate for interest rate hedge agreements 2.57% 2.57%  
Loss recognized related to the early termination of interest rate hedge agreements $ 1,700    
$2.2 billion unsecured senior line of credit      
Derivative [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Amount, Net 343,000 $ 343,000  
Unsecured Senior Bank Term Loan      
Derivative [Line Items]      
Repayments of Libor-based debt 350,000    
Commercial Paper      
Derivative [Line Items]      
Commercial paper issuance balance $ 750,000 $ 750,000  
Commercial Paper | Maximum      
Derivative [Line Items]      
Number of maturity days from date of issuance   397