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Long-term debt outstanding (Details 2) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Long-term debt outstanding [Line Items] |  |
Long-term debt | $ 2,243,107 | $ 2,108,695
Long-term debt due within one year | 16,540 | 251,854
Long-term debt | $ 2,226,567 | 1,856,841
Senior Notes |  |
Long-term debt outstanding [Line Items] |  |
Weighted average interest rate | 4.45% |
Long-term debt | $ 1,850,000 | 1,381,000
Commercial paper |  |
Long-term debt outstanding [Line Items] |  |
Weighted average interest rate | 2.04% |
Long-term debt | $ 222,900 | 338,100
Term Loan Agreements |  |
Long-term debt outstanding [Line Items] |  |
Weighted average interest rate | 2.00% |
Long-term debt | $ 9,100 | 209,800
Credit Agreements |  |
Long-term debt outstanding [Line Items] |  |
Weighted average interest rate | 4.40% |
Long-term debt | $ 89,050 | 110,100
Medium-term notes |  |
Long-term debt outstanding [Line Items] |  |
Weighted average interest rate | 6.68% |
Long-term debt | $ 50,000 | 50,000
Other notes |  |
Long-term debt outstanding [Line Items] |  |
Weighted average interest rate | 4.48% |
Long-term debt | $ 29,117 | 25,229
Long-term debt |  |
Long-term debt outstanding [Line Items] |  |
Unamortized debt issuance costs | 7,010 | 5,207
Discount | $ 50 | $ 327

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