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v3.20.1

Long-term debt (Tables) | 12 Months Ended
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Dec. 31, 2019
Noncurrent Liabilities [Abstract] |
Long-term debt table |
|  |  | 2019 |  |  | 2018
Unsecured debentures |  |  |  |  |
| Series D - 5.67% debentures due September 2, 2019 | $ | - |  | $ | 499,599
| Series E - 3.75% debentures due November 14, 2022 |  | 399,152 |  |  | 398,873
| Series F - 5.09% debentures due November 14, 2042 |  | 99,302 |  |  | 99,286
| Series G - 4.19% debentures due June 24, 2024 |  | 498,264 |  |  | 497,913
|  |  | 996,718 |  |  | 1,495,671
Less current portion |  | - |  |  | (499,599)
Total | $ | 996,718 |  | $ | 996,072
The table below represents currently scheduled maturities of long-term debt:
| 2020 | 2021 | 2022 | 2023 | 2024 | Thereafter |  | Total
$ | - | - | 399,152 | - | 498,264 | 99,302 | $ | 996,718

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