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Long-term debt outstanding (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Long-term debt outstanding [Line Items]    
Long-term debt $ 2,841,425 $ 2,741,900
Long-term debt due within one year 78,031 148,053
Long-term debt $ 2,763,394 2,593,847
Senior Notes    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 4.32%  
Long-term debt $ 2,258,500 2,125,000
Commercial paper    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 5.13%  
Long-term debt $ 415,500 450,300
Credit Agreements    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 6.31%  
Long-term debt $ 130,000 127,500
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 3.64%  
Long-term debt $ 7,000 7,700
Other notes    
Long-term debt outstanding [Line Items]    
Weighted average interest rate 1.00%  
Long-term debt $ 2,253 2,564
Long-term debt    
Long-term debt outstanding [Line Items]    
Unamortized debt issuance costs 6,542 6,090
Discount $ 286 $ 74