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Earnings per share (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Calculation Of Basic And Diluted Earnings Per Share [Abstract]      
Profit/(loss) for the period used for calculation of EPS (basic) $ 6,602 $ 9,260 $ 105,302
Interest and amortization on the convertible notes 0 0 11,340
Profit/(loss) for the period used for calculation of EPS (dilutive) $ 6,602 $ 9,260 $ 116,641
Basic earnings per share      
Weighted average number of shares (basic) 124,536,338,000 93,382,757,000 92,793,154,000
Dilutive equity awards 0 6,853,000 92,827,000
Dilutive shares related to convertible notes 0 0 19,212,240,000
Weighted average number of shares (dilutive) 124,536,338,000 93,389,610,000 112,098,221,000