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Long-term debt (Tables)
12 Months Ended
Dec. 31, 2019
Noncurrent Liabilities [Abstract]  
Long-term debt table
20192018
Unsecured debentures
Series D - 5.67% debentures due September 2, 2019$-$499,599
Series E - 3.75% debentures due November 14, 2022399,152398,873
Series F - 5.09% debentures due November 14, 204299,30299,286
Series G - 4.19% debentures due June 24, 2024498,264497,913
996,7181,495,671
Less current portion-(499,599)
Total$996,718$996,072

The table below represents currently scheduled maturities of long-term debt:
20202021202220232024ThereafterTotal
$--399,152-498,26499,302$996,718