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Income and other taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Taxes [Abstract] |
Components of income tax expense | Income tax recovery (expense):
For the years ended December 31 | 2020 | 2019
Current tax recovery (expense): |  |
Current period before undernoted items | $ | (27,759) |  | $ | (38,953) |
Adjustments to prior years | 2,563 |  | 144 |
| (25,196) |  | (38,809) |
Deferred tax recovery (expense): |  |
Origination and reversal of temporary differences | 89,301 |  | 31,389 |
Adjustments to prior years | (1,067) |  | (138) |
Changes in tax rates | (5,031) |  | 2,141 |
Other | 4,098 |  | 943 |
| 87,301 |  | 34,335 |
Total income tax recovery (expense) | $ | 62,105 |  | $ | (4,474) |
Reconciliation of accounting profit multiplied by applicable tax rates | 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 | 2020 | 2019
Income (loss) before income taxes | $ | (187,432) |  | $ | 120,840 |
Deduct earnings of associate | (29,577) |  | (52,218) |
| (217,009) |  | 68,622 |
Canadian statutory tax rate | 25.6 | % | 26.8 | %
Income tax recovery (expense) calculated at Canadian statutory tax rate | 55,554 |  | (18,411) |
Decrease (increase) in income tax expense resulting from: |  |
Impact of income and losses taxed in foreign jurisdictions | 3,771 |  | 7,001 |
Utilization of unrecognised loss carryforwards and temporary differences | 7,013 |  | 6,945 |
Impact of tax rate changes | (5,031) |  | 2,141 |
Impact of foreign exchange | 3,748 |  | (484) |
Other business taxes | (3,081) |  | (2,798) |
Impact of recovery items (expenses) not taxable (deductible) for tax purposes | (5,461) |  | 1,826 |
Adjustments to prior years | 1,496 |  | 6 |
Other | 4,096 |  | (700) |
Total income tax recovery (expense) | 62,105 |  | $ | (4,474) |
Effect of temporary difference, unused tax losses and unused tax credits and analysis of change in deferred income tax liabilities | The tax effect of temporary differences that give rise to deferred income tax liabilities and deferred income tax assets is as follows:
As at |  | Dec 31, 2020 |  |  | Dec 31, 2019
| Net | Deferred tax assets | Deferred tax liabilities |  | Net | Deferred tax assets | Deferred tax liabilities
Property, plant and equipment (owned) | $ | (448,533) |  | $ | (262,020) |  | $ | (186,513) |  |  | $ | (447,077) |  | $ | (250,890) |  | $ | (196,187) |
Right-of-use assets | (43,386) |  | (35,297) |  | (8,089) |  |  | (45,501) |  | (26,725) |  | (18,776) |
Repatriation taxes | (102,370) |  | — |  | (102,370) |  |  | (93,363) |  | — |  | (93,363) |
Other | (15,205) |  | — |  | (15,205) |  |  | (10,424) |  | (48) |  | (10,376) |
| (609,494) |  | (297,317) |  | (312,177) |  |  | (596,365) |  | (277,663) |  | (318,702) |
Non-capital loss carryforwards | 391,132 |  | 339,396 |  | 51,736 |  |  | 286,004 |  | 286,004 |  | — |
Lease obligations | 56,894 |  | 44,455 |  | 12,439 |  |  | 56,802 |  | 33,979 |  | 22,823 |
Share-based compensation | 14,669 |  | 1,758 |  | 12,911 |  |  | 3,075 |  | — |  | 3,075 |
Other | 70,931 |  | 49,232 |  | 21,699 |  |  | 89,278 |  | 69,294 |  | 19,984 |
| 533,626 |  | 434,841 |  | 98,785 |  |  | 435,159 |  | 389,277 |  | 45,882 |
Net deferred income tax assets (liabilities) | $ | (75,868) |  | $ | 137,524 |  | $ | (213,392) |  |  | $ | (161,206) |  | $ | 111,614 |  | $ | (272,820) |
As at December 31, 2020, deferred income tax assets have been recognized in respect of non-capital loss carryforwards generated in the United States. These loss carryforwards expire as follows:
| Dec 31 2020
| Gross amount | Tax effect
Expire |  |
Losses generated in 2014 (expires 2034) | $ | 33,252 |  | $ | 7,648 |
Losses generated in 2015 (expires 2035) | 351,625 |  | 80,874 |
Losses generated in 2016 (expires 2036) | 432,581 |  | 99,494 |
Losses generated in 2017 (expires 2037) | 234,941 |  | 54,036 |
| 1,052,399 |  | 242,052 |
No expiry |  |
Losses generated in 2019 | 232,163 |  | 53,397 |
Losses generated in 2020 | 140,021 |  | 32,205 |
Total non-capital loss carryforwards | $ | 1,424,583 |  | $ | 327,654 |
Analysis of the change in deferred income tax assets and liabilities:
|  | 2020 |  |  |  | 2019 |
| Net | Deferred tax assets | Deferred tax liabilities |  | Net | Deferred tax assets | Deferred tax liabilities
Balance, January 1 | $ | (161,206) |  | $ | 111,614 |  | $ | (272,820) |  |  | $ | (221,682) |  | $ | 59,532 |  | $ | (281,214) |
Adjustment on adoption of IFRS 16 | — |  | — |  | — |  |  | 4,529 |  | 533 |  | 3,996 |
Balance, January 1 (restated) | (161,206) |  | 111,614 |  | (272,820) |  |  | (217,153) |  | 60,065 |  | (277,218) |
Deferred income tax recovery included in net income | 87,301 |  | 28,243 |  | 59,058 |  |  | 34,335 |  | 28,875 |  | 5,460 |
Deferred income tax recovery (expense) included in other comprehensive income | (2,325) |  | (2,333) |  | 8 |  |  | 22,049 |  | 21,871 |  | 178 |
Other | 362 |  | — |  | 362 |  |  | (437) |  | 803 |  | (1,240) |
Balance, December 31 | $ | (75,868) |  | $ | 137,524 |  | $ | (213,392) |  |  | $ | (161,206) |  | $ | 111,614 |  | $ | (272,820) |

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