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Long-term debt (Tables)
12 Months Ended
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