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Long-term debt (Tables) | 12 Months Ended
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Dec. 31, 2022
Noncurrent Liabilities [Abstract] |
Long-term debt | 2022 2021 Unsecured debentures Series F - 5.09 % debentures due November 14, 2042 99,355 99,336 Series G - 4.19 % debentures due June 24, 2024 499,407 499,010 Series H - 2.95 % debentures due October 21, 2027 398,238 397,904 Total $ 997,000 $ 996,250 The table below represents currently scheduled maturities of long-term debt: 2023 2024 2025 2026 2027 Thereafter Total $ - 499,407 - - 398,238 99,355 $ 997,000

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