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Shareholders' equity (Details) € / shares in Units, $ / shares in Units, $ in Thousands, € in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 15, 2015 USD ($) $ / shares shares | Feb. 05, 2014 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2016 EUR (€) item € / shares shares | Dec. 31, 2016 USD ($) item shares | Dec. 31, 2015 € / shares | Dec. 31, 2015 USD ($) shares
Shareholders' equity |  |  |  |  |  |  |  |
Authorized share capital |  |  |  |  | € 3.0 | $ 3,200 |  |
Exchange rate (in USD per Euro) |  |  |  |  | 1.05204 | 1.05204 |  |
Authorized share capital (in shares) | shares |  |  |  |  | 60,000,000 | 60,000,000 |  | 60,000,000
Par value of common stock ( in dollars per share) | € / shares |  |  |  |  | € 0.05 |  | € 0.05 |
Number of classes of ordinary shares | item |  |  |  |  | 1 | 1 |  |
Reserves for foreign currency translation effects | $ |  |  |  | $ 5,300 |  | $ 6,600 |  | $ 6,800
Shares issued (in shares) | shares | 3,000,000 | 5,400,000 |  |  |  |  |  |
Price of shares issued (in dollars per share) | $ / shares | $ 29.50 | $ 17.00 |  |  |  |  |  |
Proceeds from issuance initial public offering | $ | $ 82,500 | $ 84,500 | $ 82,519 | $ 84,462 |  |  |  |

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