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Intangible assets and goodwill - Schedule of Goodwill (Details) - 12 months ended Dec. 31, 2019
$ in Thousands, $ in Thousands
USD ($)
CAD ($)
Goodwill [Roll Forward]    
Goodwill beginning of the period $ 954,282 $ 954,282
Business acquisitions (note 3(a))   76,313
Foreign exchange   $ 1,101
Goodwill end of the period $ 1,031,696