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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income taxes |
Schedule of Effective Income Tax Rate Reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, |  | 2020 |  | 2019 |  | 2018 |
Earnings before income tax | ​ | $ | 235,888 | ​ | $ | 190,763 | ​ | $ | 152,512 | ​
Statutory federal and provincial tax rate in British Columbia, Canada | ​ |  | 27.00 | % |  | 27.00 | % |  | 27.00 | %
Expected income tax expense | ​ | $ | 63,690 | ​ | $ | 51,506 | ​ | $ | 41,178 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-deductible expenses | ​ |  | 4,732 | ​ |  | 3,705 | ​ |  | 4,810 | ​
Adjustment to prior year provision to statutory tax returns | ​ |  | (865) | ​ |  | 4 | ​ |  | 1,323 | ​
Changes in the valuation of deferred tax assets | ​ |  | (2,027) | ​ |  | (550) | ​ |  | (771) | ​
Different tax rates of subsidiaries operating in foreign jurisdictions | ​ |  | (12,016) | ​ |  | (11,818) | ​ |  | (17,145) | ​
U.S. tax reform impacts | ​ |  | 17,105 | ​ |  | 6,949 | ​ |  | 4,899 | ​
Change in enacted tax rates | ​ |  | 391 | ​ |  | (1,016) | ​ |  | 93 | ​
Unrecognized tax benefits | ​ |  | 817 | ​ |  | (2,347) | ​ |  | (1,800) | ​
Benefits of deductible stock options vested and exercised | ​ |  | (4,070) | ​ |  | (1,780) | ​ |  | (2,434) | ​
Other | ​ |  | (2,227) | ​ |  | (3,030) | ​ |  | 853 | ​
​ | ​ | $ | 65,530 | ​ | $ | 41,623 | ​ | $ | 31,006 | ​
Summary of Income Tax Expense (Recovery) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, |  | 2020 |  | 2019 |  | 2018
Canadian: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current tax expense | ​ | $ | 27,766 | ​ | $ | 19,752 | ​ | $ | 13,209
Deferred tax expense | ​ |  | 3,970 | ​ |  | 3,346 | ​ |  | 3,958
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Foreign: | ​ |  |  | ​ |  |  | ​ |  |
Current tax expense before application of operating loss carryforwards | ​ |  | 30,280 | ​ |  | 24,815 | ​ |  | 19,851
Tax benefit of operating loss carryforwards | ​ |  | (1,668) | ​ |  | (11,770) | ​ |  | (8,293)
Total current tax expense | ​ |  | 28,612 | ​ |  | 13,045 | ​ |  | 11,558
Deferred tax expense before adjustment | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
to opening valuation allowance | ​ |  | 6,127 | ​ |  | 5,727 | ​ |  | 2,386
Adjustment to opening valuation allowance | ​ |  | (945) | ​ |  | (247) | ​ |  | (105)
Total deferred tax expense | ​ |  | 5,182 | ​ |  | 5,480 | ​ |  | 2,281
​ | ​ | $ | 65,530 | ​ | $ | 41,623 | ​ | $ | 31,006
Schedule of Deferred Tax Assets and Liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
As at December 31, |  | 2020 |  | 2019
Deferred tax assets: |  | ​ |  |  | ​ |
Working capital | ​ | $ | 13,185 | ​ | $ | 13,307
Property, plant and equipment | ​ |  | 6,467 | ​ |  | 5,579
Share-based compensation | ​ |  | 5,606 | ​ |  | 5,973
Tax losses and tax credit carryforwards | ​ |  | 25,943 | ​ |  | 33,248
Lease liabilities | ​ | ​ | 29,393 | ​ | ​ | 29,523
Other | ​ |  | 8,848 | ​ |  | 3,088
​ | ​ |  | 89,442 | ​ |  | 90,718
Deferred tax liabilities: | ​ |  |  | ​ |  |
Property, plant and equipment | ​ | $ | (16,838) | ​ | $ | (14,783)
Goodwill | ​ |  | (2,255) | ​ |  | (8,499)
Intangible assets | ​ |  | (52,218) | ​ |  | (50,531)
Right-of-use assets | ​ | ​ | (26,206) | ​ | ​ | (25,244)
Long-term debt | ​ | ​ | (3,571) | ​ | ​ | (1,883)
Other | ​ |  | (7,165) | ​ |  | (5,613)
​ | ​ |  | (108,253) | ​ |  | (106,553)
Net deferred tax liabilities | ​ | $ | (18,811) | ​ | $ | (15,835)
​ | ​ | ​ | ​ | ​ | ​ | ​
Valuation allowance | ​ |  | (12,995) | ​ |  | (12,913)
​ | ​ | $ | (31,806) | ​ | $ | (28,748)
Schedule of Non-capital Loss Carryforwards | ​
​ | ​ | ​ | ​
2021 |  | $ | 2,430
2022 | ​ |  | 2,905
2023 | ​ |  | 3,137
2024 | ​ |  | 823
2025 and thereafter | ​ |  | 65,003
​ | ​ | $ | 74,298
Schedule of Unrecognized Tax Benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
As at December 31, |  | 2020 |  | 2019
Unrecognized tax benefits, beginning of year | ​ | $ | 20,232 | ​ | $ | 22,584
Increases - tax positions taken in prior period | ​ |  | 1,487 | ​ |  | 700
Decreases - tax positions taken in prior period | ​ |  | — | ​ |  | (57)
Increases - tax positions taken in current period | ​ |  | 558 | ​ |  | 1,268
Settlement and lapse of statute of limitations | ​ |  | (2,591) | ​ |  | (4,364)
Currency translation adjustment | ​ |  | 612 | ​ |  | 101
Unrecognized tax benefits, end of year | ​ | $ | 20,298 | ​ | $ | 20,232

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