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Long-term debt outstanding (Details 1) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Long-term debt outstanding [Line Items] |  |  |
Long-term debt | $ 2,281,876 | $ 2,243,107 | $ 2,379,806
Long-term debt due within one year | 16,560 | 16,540 | 51,822
Long-term debt | $ 2,265,316 | 2,226,567 | 2,327,984
Senior Notes |  |  |
Long-term debt outstanding [Line Items] |  |  |
Weighted Average Interest Rate | 4.43% |  |
Long-term debt | $ 1,900,000 | 1,850,000 | 1,656,000
Commercial Paper |  |  |
Long-term debt outstanding [Line Items] |  |  |
Weighted Average Interest Rate | 1.02% |  |
Long-term debt | $ 290,100 | 222,900 | 433,350
Term Loan Agreements |  |  |
Long-term debt outstanding [Line Items] |  |  |
Weighted Average Interest Rate | 2.00% |  |
Long-term debt | $ 9,100 | 9,100 | 209,800
Credit Agreements |  |  |
Long-term debt outstanding [Line Items] |  |  |
Weighted Average Interest Rate | 3.25% |  |
Long-term debt | $ 11,200 | 89,050 | 11,075
Medium-term Notes |  |  |
Long-term debt outstanding [Line Items] |  |  |
Weighted Average Interest Rate | 6.68% |  |
Long-term debt | $ 50,000 | 50,000 | 50,000
Other Notes |  |  |
Long-term debt outstanding [Line Items] |  |  |
Weighted Average Interest Rate | 4.59% |  |
Long-term debt | $ 28,342 | 29,117 | 26,105
Long-term Debt |  |  |
Long-term debt outstanding [Line Items] |  |  |
Unamortized Debt Issuance Costs | 6,668 | 7,010 | 6,164
Discount | $ 198 | $ 50 | $ 360

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