Supplementary cash flow information (Tables)

12 Months Ended

Dec. 31, 2018

Statements [Line Items]

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

		Year ended December 31,
		2018			2017
Change in:
Trade and other receivables	$	16,198		$	(8,979	)
Other financial assets/liabilities		(17,290	)		6,620
Inventories		(32	)		(18,690	)
Prepaid expenses		(38	)		(4,619	)
Trade and other payables		(19,608	)		(6,336	)
Change in taxes payable/receivable, net		7,881			39,326
Provisions and other liabilities		(1,030	)		1,693
	$	(13,919	)	$	9,015