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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

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