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Shareholders' capital Shareholders' Capital - Bonus Deferral RSUs (Details) - Bonus Deferral Restricted Stock Units $ / shares in Units, $ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) shares | Dec. 31, 2019 CAD ($) $ / shares | Dec. 31, 2018 CAD ($) $ / shares shares | Dec. 31, 2017 CAD ($)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Beginning balance (in shares) | shares | 127,066 |  | 0 |
Granted, including dividends (in shares) | shares | 135,324 |  | 131,611 |
Exercised (in shares) | shares |  |  | (4,545) |
Ending balance (in shares) | shares | 262,390 |  | 127,066 |
Weighted average grant-date fair value |  |  |  |
Beginning balance (CAD per share) | $ / shares |  | $ 12.82 | $ 0 |
Granted, including dividends (CAD per share) | $ / shares |  | 15.40 | 12.82 |
Exercised (CAD per share) | $ / shares |  |  | 12.82 |
Ending balance (CAD per share) | $ / shares |  | $ 14.15 | $ 12.82 |
Outstanding, aggregate intrinsic value | $ |  | $ 4,820 | $ 1,745 | $ 0
Granted, including dividends, aggregate intrinsic value | $ 2,084 |  | 1,683 |
Exercised, aggregate intrinsic value | $ |  |  | $ 61 |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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