Supplementary cash flow information (Tables)

12 Months Ended

Dec. 31, 2020

Supplementary Cash Flow Information [Abstract]

Disclosure of detailed information about supplemental cash flow information [Table Text Block]

		Year ended December 31,
		2020			2019
Change in:
Trade and other receivables	$	(37,720	)	$	3,252
Other financial assets/liabilities		4,077			12,540
Inventories		(2,867	)		(11,759	)
Prepaid expenses		(3,722	)		(3,484	)
Trade and other payables		36,247			5,613
Provisions and other liabilities		1,602			(2,590	)
	$	(2,383	)	$	3,572