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Related parties (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure Of Transactions Between Related Parties [Abstract]  
Compensation for key management personnel
Compensation for key management personnel was comprised of:
20182017
Short-term employee benefits$24,821$26,569
Share-based compensation12,79611,525
Post-employment benefits4,3235,914
Termination benefits860916
Total$42,800$44,924
(a) Excludes deferred share units held by directors (see note 24).