Share-based compensation - 2012 Plan (Details) - 9 months ended Sep. 30, 2017 $ in Millions	€ / shares	USD ($) shares
Weighted average exercise price
Outstanding at beginning of year (in euros/dollars per share) \| € / shares	€ 5.13
Exercised (in euros/dollars per share) \| € / shares	3.07
Forfeited (in euros/dollars per share) \| € / shares	3.07
Expired (in euros/dollars per share) \| € / shares	3.07
Outstanding at end of year (in euros/dollars per share) \| € / shares	€ 8.52
2012 Plan
Options
Outstanding at beginning of year (in shares) \| shares		483,006
Exercised (in shares) \| shares		(286,804)
Forfeited (in shares) \| shares		(5,000)
Expired (in shares) \| shares		(9,000)
Outstanding at end of year (in shares) \| shares		182,202
2012 Plan \| Share options
Share-based compensation
Proceeds from options exercised \| $		$ 1.0

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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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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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Number of share options (or share units) exercised during the current period.

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