Intangible assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Indefinite-Lived Intangible Assets

Changes in net book value during the presented periods are summarized below:

	Software			Technology and customer relationships			Construction in Progress			Total
	(in thousands)
Net book value at January 1, 2015	$	5,122		$	7,356		$	343		$	12,821
Additions to intangible assets	5,645			554			1,172			7,371
Amortization expense	(3,631		)	(6,604		)	—			(10,235		)
Change in consolidation scope	1			7,800			—			7,801
Currency translation adjustment	(570		)	(666		)	(52		)	(1,288		)
Transfer into service	314			—			(314		)	—
Net book value at December 31, 2015	6,881			8,440			1,149			16,470
Gross book value at end of period	15,863			18,538			1,149			35,550
Accumulated depreciation and impairment at end of period	(8,982		)	(10,098		)	—			(19,080		)
Net book value at January 1, 2016	6,881			8,440			1,149			16,470
Additions to intangible assets	7,972			553			—			8,525
Amortization expense	(3,449		)	(4,969		)	—			(8,418		)
Change in consolidation scope	3			86,230			788			87,021
Currency translation adjustment	(455		)	(185		)	(14		)	(654		)
Transfer into service	435			594			(1,029		)	—
Net book value at December 31, 2016	$	11,387		$	90,663		$	894		$	102,944
Gross book value at end of period	22,770			106,328			894			129,992
Accumulated depreciation and impairment at end of period	(11,383		)	(15,665		)	—			(27,048		)

Schedule of Finite-Lived Intangible Assets

Changes in net book value during the presented periods are summarized below:

	Software			Technology and customer relationships			Construction in Progress			Total
	(in thousands)
Net book value at January 1, 2015	$	5,122		$	7,356		$	343		$	12,821
Additions to intangible assets	5,645			554			1,172			7,371
Amortization expense	(3,631		)	(6,604		)	—			(10,235		)
Change in consolidation scope	1			7,800			—			7,801
Currency translation adjustment	(570		)	(666		)	(52		)	(1,288		)
Transfer into service	314			—			(314		)	—
Net book value at December 31, 2015	6,881			8,440			1,149			16,470
Gross book value at end of period	15,863			18,538			1,149			35,550
Accumulated depreciation and impairment at end of period	(8,982		)	(10,098		)	—			(19,080		)
Net book value at January 1, 2016	6,881			8,440			1,149			16,470
Additions to intangible assets	7,972			553			—			8,525
Amortization expense	(3,449		)	(4,969		)	—			(8,418		)
Change in consolidation scope	3			86,230			788			87,021
Currency translation adjustment	(455		)	(185		)	(14		)	(654		)
Transfer into service	435			594			(1,029		)	—
Net book value at December 31, 2016	$	11,387		$	90,663		$	894		$	102,944
Gross book value at end of period	22,770			106,328			894			129,992
Accumulated depreciation and impairment at end of period	(11,383		)	(15,665		)	—			(27,048		)

Schedule of estimated future amortization expense related to intangible assets

As of December 31, 2016, expected amortization expense for intangible assets other than intangible assets recognized in conjunction with the HookLogic acquisition (refer to Note 3) for the next five years is as follows (in thousands):

	Software		Technology and customer relationships		Total
2017	$	5,116	$	2,709	$	7,825
2018	4,321		2,411		6,732
2019	2,218		436		2,654
2020	586		—		586
2021	11		—		11
Total	$	12,252	$	5,556	$	17,808