Other financial assets (Tables)

12 Months Ended

Dec. 31, 2017

Statement [Line Items]

Disclosure of other financial assets [Table Text Block]

		Dec. 31, 2017		Dec. 31, 2016
Current
Derivative assets	$	2,841	$	3,397
Non-current
Available-for-sale investments		21,973		13,508
Investments at fair value through profit or loss		282		192
Restricted cash (note 26d)		206		17,148
		22,461		30,848
	$	25,302	$	34,245

Disclosure of available-for-sale financial assets [text block] [Table Text Block]

		Dec. 31, 2017			Dec. 31, 2016
Balance, beginning of year	$	13,508		$	9,206
Additions		5,265			2,857
Increase from remeasurement to fair value		2,507			3,598
Disposals		(229	)		(2,206	)
Effect of movements in exchange rates		922			53
Balance, end of year	$	21,973		$	13,508