Other liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Statement [Line Items]

Disclosure of other current liabilities [Table Text Block]

		Dec. 31, 2017		Dec. 31, 2016
Current
Provisions (note 18)	$	27,370	$	14,367
Pension liability (note 19)		19,401		24,635
Other employee benefits (note 20)		2,756		2,356
Unearned revenue		2,435		849
	$	51,962	$	42,207