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Related parties (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure Of Transactions Between Related Parties [Abstract]  
Compensation for key management personnel
Compensation for key management personnel was comprised of:
20172016
Short-term employee benefits$26,569$17,673
Share-based compensation11,52510,464
Post-employment benefits5,9145,910
Termination benefits916608
$44,924$34,655
(a) Excludes deferred share units held by directors (see note 22).