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Intangible assets (Tables)

12 Months Ended

Dec. 31, 2019

Intangible Assets And Goodwill [Abstract]

Reconciliation of carrying amount of goodwill and intangibles

At December 31, 2019


						Intellectual
				Contracts		property		Total


Cost
Beginning of year			$	119,371	$	118,819	$	238,190
Effect of movements in exchange rates				(5,664)		-		(5,664)

End of year				113,707		118,819		232,526


Accumulated amortization and impairment
Beginning of year				115,434		57,154		172,588
Amortization charge				1,181		3,868		5,049
Effect of movements in exchange rates				(5,521)		-		(5,521)

End of year				111,094		61,022		172,116


Net book value at December 31, 2019			$	2,613	$	57,797	$	60,410

At December 31, 2018


						Intellectual
				Contracts		property		Total


Cost
Beginning of year			$	109,812	$	118,819	$	228,631
Effect of movements in exchange rates				9,559		-		9,559

End of year				119,371		118,819		238,190


Accumulated amortization and impairment
Beginning of year				104,939		53,680		158,619
Amortization charge				1,325		3,474		4,799
Effect of movements in exchange rates				9,170		-		9,170

End of year				115,434		57,154		172,588


Net book value at December 31, 2018			$	3,937	$	61,665	$	65,602