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Income and other taxes | 12 Months Ended
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Dec. 31, 2018
Income Taxes [Abstract] |
Income and other taxes | Income and other taxes: a) Income tax expense:
For the years ended December 31 | 2018 |  | 2017 |
Current tax recovery (expense): |  |
Current period before undernoted items | $ | (117,496 | ) | $ | (95,402 | )
Benefit from unrecognised loss carry forwards | 23,860 |  | 10,115 |
Adjustments to prior years | 2,609 |  | (217 | )
| (91,027 | ) | (85,504 | )
Deferred tax recovery (expense): |  |
Origination and reversal of temporary differences | (56,258 | ) | 23,310 |
Adjustments to prior years | (2,331 | ) | 200 |
Change in U.S. tax rate | — |  | (36,567 | )
Change in other jurisdictions tax rates | 35 |  | 734 |
Other | (3,910 | ) | 2,039 |
| (62,464 | ) | (10,284 | )
Total income tax expense | $ | (153,491 | ) | $ | (95,788 | )
b) Reconciliation of the effective tax rate: The Company operates in several tax jurisdictions and therefore its income is subject to various rates of taxation. Income tax expense differs from the amounts that would be obtained by applying the Canadian statutory income tax rate to net income before income taxes as follows:
For the years ended December 31 | 2018 |  | 2017 |
Income before income taxes | $ | 811,475 |  | $ | 470,885 |
Deduct earnings of associate | (72,001 | ) | (75,995 | )
| 739,474 |  | 394,890 |
Canadian statutory tax rate | 27.0 | % | 26.5 | %
Income tax expense calculated at Canadian statutory tax rate | (199,658 | ) | (104,646 | )
Increase (decrease) in income tax expense resulting from: |  |
Impact of income and losses taxed in foreign jurisdictions | 15,754 |  | 30,223 |
Utilization of unrecognised loss carryforwards and temporary differences | 31,325 |  | 20,468 |
Impact of tax rate changes in the U.S. | — |  | (36,567 | )
Impact of tax rate changes in other jurisdictions | 35 |  | 734 |
Impact of foreign exchange | (173 | ) | 3,104 |
Other business taxes | (7,750 | ) | (4,105 | )
Tax effect of recovery (expenses) that are not taxable (deductible) for tax purposes | 7,015 |  | (4,112 | )
Adjustments to prior years | 278 |  | (17 | )
Other | (317 | ) | (870 | )
Total income tax expense | $ | (153,491 | ) | $ | (95,788 | )
c) Net deferred income tax liabilities: (i) The tax effect of temporary differences that give rise to deferred income tax liabilities and deferred income tax assets are as follows:
As at |  | Dec 31 2018 |  |  | Dec 31 2017
| Net |  | Deferred tax assets |  | Deferred tax liabilities |  |  | Net |  | Deferred tax assets |  | Deferred tax liabilities |
Property, plant and equipment | $ | (425,743 | ) | $ | (212,087 | ) | $ | (213,656 | ) |  | $ | (399,391 | ) | $ | (189,368 | ) | $ | (210,023 | )
Repatriation taxes | (94,446 | ) | — |  | (94,446 | ) |  | (87,239 | ) | — |  | (87,239 | )
Other | (14,930 | ) | (6,700 | ) | (8,230 | ) |  | (11,670 | ) | (3,740 | ) | (7,930 | )
| (535,119 | ) | (218,787 | ) | (316,332 | ) |  | (498,300 | ) | (193,108 | ) | (305,192 | )
Non-capital loss carryforwards | 233,237 |  | 233,237 |  | — |  |  | 244,576 |  | 244,576 |  | — |
Share-based compensation | 10,908 |  | 1,170 |  | 9,738 |  |  | 19,920 |  | 2,946 |  | 16,974 |
Other | 69,292 |  | 43,912 |  | 25,380 |  |  | 69,713 |  | 47,927 |  | 21,786 |
| 313,437 |  | 278,319 |  | 35,118 |  |  | 334,209 |  | 295,449 |  | 38,760 |
Net deferred income tax assets (liabilities) | $ | (221,682 | ) | $ | 59,532 |  | $ | (281,214 | ) |  | $ | (164,091 | ) | $ | 102,341 |  | $ | (266,432 | )
The Company recognizes deferred income tax assets to the extent that it is probable that the benefit of these assets will be realized. As at December 31, 2018, the Company had $354 million (2017 - $ 384 million) of deductible temporary differences in the United States that have not been recognized. (ii) Analysis of the change in deferred income tax assets and liabilities:
|  |  | 2018 |  |  |  |  | 2017 |
| Net |  | Deferred tax assets |  | Deferred tax liabilities |  |  | Net |  | Deferred tax assets |  | Deferred tax liabilities |
Balance, January 1 | $ | (164,091 | ) | $ | 102,341 |  | $ | (266,432 | ) |  | $ | (153,639 | ) | $ | 137,341 |  | $ | (290,980 | )
Deferred income tax recovery (expense) included in net income | (62,464 | ) | (44,277 | ) | (18,187 | ) |  | (10,284 | ) | (34,517 | ) | 24,233 |
Impact of U.S. tax rate change in other comprehensive income | — |  | — |  | — |  |  | (8,621 | ) | (8,621 | ) | — |
Deferred income tax recovery included in other comprehensive income | 3,980 |  | 1,253 |  | 2,727 |  |  | 9,295 |  | 8,398 |  | 897 |
Other | 893 |  | 215 |  | 678 |  |  | (842 | ) | (260 | ) | (582 | )
Balance, December 31 | $ | (221,682 | ) | $ | 59,532 |  | $ | (281,214 | ) |  | $ | (164,091 | ) | $ | 102,341 |  | $ | (266,432 | )

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