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Intangible assets (Tables)

12 Months Ended

Dec. 31, 2020

Intangible Assets And Goodwill [Abstract]

Reconciliation of carrying amount of goodwill and intangibles

At December 31, 2020


						Intellectual
				Contracts		property		Total


Cost
Beginning of year			$	113,707	$	118,819	$	232,526
Effect of movements in exchange rates				(2,319)		-		(2,319)

End of year				111,388		118,819		230,207


Accumulated amortization and impairment
Beginning of year				111,094		61,022		172,116
Amortization charge				1,008		3,700		4,708
Effect of movements in exchange rates				(2,439)		-		(2,439)

End of year				109,663		64,722		174,385


Net book value at December 31, 2020			$	1,725	$	54,097	$	55,822

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