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Goodwill and intangible assets (Tables)

12 Months Ended

Dec. 31, 2017

Intangible Assets And Goodwill [Abstract]

Reconciliation of carrying amount of goodwill and intangibles

At December 31, 2017


								Intellectual
		Goodwill			Contracts			property			Patents			Total


Cost
Beginning of year	$	118,664		$	117,533		$	118,819		$	11,737		$	366,753
Effect of movements in exchange rates		(7,265)			(7,721)			-			(771)			(15,757)

End of year		111,399			109,812			118,819			10,966			350,996


Accumulated amortization
Beginning of year		-			110,284			49,589			3,570			163,443
Amortization charge		-			2,002			4,091			630			6,723
Impairment charge		111,399			-			-			7,150			118,549
Effect of movements in exchange rates		-			(7,347)			-			(384)			(7,731)

End of year		111,399			104,939			53,680			10,966			280,984


Net book value at December 31, 2017	$	-		$	4,873		$	65,139		$	-		$	70,012

At December 31, 2016


								Intellectual
		Goodwill			Contracts			property			Patents			Total


Cost
Beginning of year	$	122,314		$	121,148		$	118,819		$	12,098		$	374,379
Effect of movements in exchange rates		(3,650)			(3,615)			-			(361)			(7,626)

End of year		118,664			117,533			118,819			11,737			366,753


Accumulated amortization
Beginning of year		-			108,809			45,430			3,010			157,249
Amortization charge		-			4,613			4,159			642			9,414
Effect of movements in exchange rates		-			(3,138)			-			(82)			(3,220)

End of year		-			110,284			49,589			3,570			163,443


Net book value at December 31, 2016	$	118,664		$	7,249		$	69,230		$	8,167		$	203,310