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Long-term debt (Tables)
12 Months Ended
Dec. 31, 2018
Noncurrent Liabilities [Abstract]  
Long-term debt table
20182017
Unsecured debentures
Series D - 5.67% debentures due September 2, 2019 [note 26]$499,599$499,020
Series E - 3.75% debentures due November 14, 2022398,873398,604
Series F - 5.09% debentures due November 14, 204299,28699,271
Series G - 4.19% debentures due June 24, 2024497,913497,576
1,495,6711,494,471
Less current portion(499,599)-
Total$996,072$1,494,471

The table below represents currently scheduled maturities of long-term debt:
20192020202120222023ThereafterTotal
$499,599--398,873-597,199$1,495,671