| Amounts in US$ '000 except for shares | | 2017 | | 2016 | | 2015 | | |||
| Numerator: | | | | | | | | | | |
| Loss for the year attributable to owners | | | (24,228) | | | (49,092) | | | (234,031) | |
| Denominator: | | | | | | | | | | |
| Weighted average number of shares used in basic EPS | | | 60,093,191 | | | 59,777,145 | | | 57,759,001 | |
| (Losses) after tax per share (US$) basic | | | (0.40) | | | (0.82) | | | (4.05) | |
| Amounts in US$ '000 except for shares | | 2017 (a) | | 2016 | | 2015 | | |||
| Weighted average number of shares used in basic EPS | | | 60,093,191 | | | 59,777,145 | | | 57,759,001 | |
| Effect of dilutive potential common shares (a) | | | | | | | | | | |
| Weighted average number of common shares for the purposes of diluted earnings per shares | | | 60,093,191 | | | 59,777,145 | | | 57,759,001 | |
| (Losses) after tax per share (US$) diluted | | | (0.40) | | | (0.82) | | | (4.05) | |