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Long-term debt outstanding (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Long-term debt outstanding [Line Items]      
Long-term debt $ 2,747,763 $ 2,741,900 $ 2,253,274
Long-term debt due within one year 147,953 148,053 1,552
Long-term debt $ 2,599,810 2,593,847 2,251,722
Senior Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 4.28%    
Long-term debt $ 2,275,000 2,125,000 1,950,000
Commercial Paper      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 0.90%    
Long-term debt $ 348,500 450,300 218,900
Credit Agreements      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 3.25%    
Long-term debt $ 85,800 127,500 43,350
Medium-term Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 7.32%    
Long-term debt $ 35,000 35,000 35,000
Term Loan Agreements      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 2.00%    
Long-term debt $ 7,700 7,700 8,400
Other Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 0.95%    
Long-term debt $ 2,445 2,564 3,282
Long-term Debt      
Long-term debt outstanding [Line Items]      
Unamortized Debt Issuance Costs 6,605 6,090 5,655
Discount $ 77 $ 74 $ 3