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Share-based compensation - 2012 Plan (Details) - 2012 Plan - Share options $ in Thousands		12 Months Ended					24 Months Ended
	Feb. 15, 2012	Dec. 31, 2016 USD ($) € / shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) € / shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 shares
Share-based compensation
Vesting period	3 years
Options granted (in shares)			0		0	0	1,907,815
Options
Outstanding at beginning of year (in shares)			1,077,944
Exercised (in shares)			(510,547)		(449,838)	(152,724)
Expired (in shares)			(84,391)
Outstanding at end of year (in shares)			483,006		1,077,944
Weighted average exercise price
Outstanding at beginning of year (in euros/dollars per share) | € / shares		€ 4.02
Exercised (in euros per share) | € / shares		3.12
Expired (in dollars per share) | € / shares		3.07
Outstanding at end of year (in euros/dollars per share) | € / shares		€ 5.13		€ 4.02
Weighted average remaining contractual life (in years)
Outstanding			4 years 1 month 17 days		4 years 1 month 24 days
Aggregate intrinsic value
Outstanding (in dollars) | $		€ 810	$ 810	€ 13,114	$ 13,114
Exercised (in dollars) | $			$ 4,381		$ 9,272	$ 1,357
One year from grant date
Share-based compensation
Vesting period	1 year
Vesting percentage	33.33%
Year two and three from grant date
Share-based compensation
Vesting period	3 years
Vesting percentage	66.66%

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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