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Long-term debt (Tables)	12 Months Ended
Long-term debt (Tables)	Dec. 31, 2023
Long-term debt [Abstract]
Long-term debt	2023 2022 Unsecured debentures Series F - 5.09 % debentures due November 14, 2042 $ 99,374 $ 99,355 Series G - 4.19 % debentures due June 24, 2024 499,821 499,407 Series H - 2.95 % debentures due October 21, 2027 398,582 398,238 Term loans 786,397 - 1,784,174 997,000 Less current portion (499,821) - Total $ 1,284,353 $ 997,000 The table below represents currently scheduled maturities of long-term debt: 2024 2025 2026 2027 2028 Thereafter Total $ 499,821 393,420 392,977 398,582 - 99,374 $ 1,784,174