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Long-term debt outstanding (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Long-term debt outstanding [Line Items]      
Long-term debt $ 2,927,967 $ 2,741,900 $ 2,337,049
Long-term debt due within one year 214,453 148,053 1,549
Long-term debt $ 2,713,514 2,593,847 2,335,500
Senior Notes      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 4.29%    
Long-term debt $ 2,365,000 2,125,000 1,950,000
Commercial Paper      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 1.96%    
Long-term debt $ 495,400 450,300 297,400
Credit Agreements      
Long-term debt outstanding [Line Items]      
Weighted Average Interest Rate 4.75%    
Long-term debt $ 29,860 127,500 48,550
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 $ 2,411 2,564 3,232
Long-term Debt      
Long-term debt outstanding [Line Items]      
Unamortized Debt Issuance Costs 6,809 6,090 5,505
Discount $ 595 $ 74 $ 28