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Shareholders’ equity, net (Details 2) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Dividends recognised as distributions to owners | $ (28,135) | $ (15,021) | $ (10,488)
Dividends 2017 [Member] | Annual General Meeting [Member] |  |  |
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Dividends recognised as distributions to owners | 14,479 |  |
Dividends 2017 [Member] | Directors Meeting [Member] |  |  |
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Dividends recognised as distributions to owners | 7,620 |  |
Dividends 2016 [Member] | Directors Meeting [Member] |  |  |
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Dividends recognised as distributions to owners |  | 7,621 |
Ordinary shares [member] | Dividends 2017 [Member] | Annual General Meeting [Member] |  |  |
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Dividends recognised as distributions to owners | $ 15,711 |  |
Dividends paid, ordinary shares per share | $ 0.056 |  |
Ordinary shares [member] | Dividends 2017 [Member] | Directors Meeting [Member] |  |  |
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Dividends recognised as distributions to owners | $ 8,269 |  |
Dividends paid, ordinary shares per share | $ 0.030 |  |
Ordinary shares [member] | Dividends 2016 [Member] | Directors Meeting [Member] |  |  |
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Dividends recognised as distributions to owners |  | $ 8,269 |
Dividends paid, ordinary shares per share |  | $ 0.030 |
Treasury shares [member] | Dividends 2017 [Member] | Annual General Meeting [Member] |  |  |
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Dividends recognised as distributions to owners | $ (1,232) |  |
Treasury shares [member] | Dividends 2017 [Member] | Directors Meeting [Member] |  |  |
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Dividends recognised as distributions to owners | $ (649) |  |
Treasury shares [member] | Dividends 2016 [Member] | Directors Meeting [Member] |  |  |
Disclosure of Shareholders’ equity, net [Line Items] |  |  |
Dividends recognised as distributions to owners |  | $ (648) |

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