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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

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