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Long-term debt outstanding (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Long-term debt outstanding [Line Items]    
Long-term debt $ 2,741,900 $ 2,213,130
Long-term debt due within one year 148,053 1,555
Long-term debt $ 2,593,847 2,211,575
Senior Notes    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 4.32%  
Long-term debt $ 2,125,000 1,950,000
Commercial paper    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 0.40%  
Long-term debt $ 450,300 125,600
Credit Agreements    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 1.94%  
Long-term debt $ 127,500 95,900
Medium-term notes    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 7.32%  
Long-term debt $ 35,000 35,000
Term Loan Agreements    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 2.00%  
Long-term debt $ 7,700 8,400
Other notes    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 1.03%  
Long-term debt $ 2,564 4,034
Long-term debt    
Long-term debt outstanding [Line Items]    
Unamortized debt issuance costs 6,090 5,803
Discount $ 74 $ 1