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Intangible assets (Tables)

12 Months Ended

Dec. 31, 2017

Text block1 [abstract]

Summary of Reconciliation of Changes in Intangible Assets and Goodwill


						Other intangibles assets
		Goodwill				License and software rights				Intangible in process				Total
Cost -
Balance at January 1, 2015		$	20,380			$	37,663			$	24,474			$	82,517
Additions			—				121				19,297				19,418
Disposals			—				(65	)			—				(65	)
Reclassifications			—				26,090				(26,090	)			—

Balance at December 31, 2015			20,380				63,809				17,681				101,870
Additions			—				73				14,401				14,474
Disposals			—				(1,546	)			—				(1,546	)
Impairment loss			—				—				(5,931	)			(5,931	)
Reclassifications			—				11,813				(10,073	)			1,740

Balance at December 31, 2016			20,380				74,149				16,078				110,607
Additions			—				1,783				16,898				18,681
Disposals			—				(4,891	)			—				(4,891	)
Reclassifications			—				3,642				(2,085	)			1,557

Balance at December 31, 2017			20,380				74,683				30,891				125,954
Amortization -
Balance at January 1, 2015		$	—			$	(25,222	)		$	—			$	(25,222	)
Amortization for the year			—				(7,287	)			—				(7,287	)
Disposals			—				65				—				65

Balance at December 31, 2015			—				(32,444	)			—				(32,444	)
Amortization for the year			—				(10,207	)			—				(10,207	)
Disposals			—				1,546				—				1,546

Balance at December 31, 2016			—				(41,105	)			—				(41,105	)
Amortization for the year			—				(8,628	)			—				(8,628	)
Disposals			—				4,894				—				4,894

Balance at December 31, 2017			—				(44,839	)			—				(44,839	)
Carrying amounts -
At December 31, 2015		$	20,380			$	31,365			$	17,681			$	69,426

At December 31, 2016		$	20,380			$	33,044			$	16,078			$	69,502

At December 31, 2017		$	20,380			$	29,844			$	30,891			$	81,115