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Long-term debt (Tables)
12 Months Ended
Dec. 31, 2020
Noncurrent Liabilities [Abstract]  
Long-term debt table
20202019
Unsecured debentures
Series E - 3.75% debentures due November 14, 2022-399,152
Series F - 5.09% debentures due November 14, 204299,31999,302
Series G - 4.19% debentures due June 24, 2024498,630498,264
Series H - 2.95% debentures due October 21, 2027397,592-
Total$995,541$996,718

The table below represents currently scheduled maturities of long-term debt:
20212022202320242025ThereafterTotal
$---498,630-496,911$995,541