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Capital Management (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary of Capitalisation and Ratio | As at December 31, 2017 and 2016, these ratios were as follows:
|  | 2017 |  |  | 2016 |
Long-term debt |  | $ | 1,730,437 |  |  | $ | 1,906,934 |
Shareholders’ equity |  |  | 1,810,336 |  |  |  | 1,962,118 |
Total capitalization |  | $ | 3,540,773 |  |  | $ | 3,869,052 |
Long-term debt to long-term debt plus equity ratio |  |  | 0.49 |  |  |  | 0.49 |

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