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Earnings (loss) per ordinary share | 12 Months Ended
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Dec. 31, 2018
Earnings per share [abstract] |
Earnings (loss) per ordinary share | 14. Earnings (loss) per ordinary share Basic earnings (loss) per ordinary share are calculated by dividing the consolidated profit (loss) for the year attributable to the Parent by the weighted average number of ordinary shares outstanding during the year, excluding the average number of treasury shares held in the year, if any. Dilutive earnings (loss) per share assumes the exercise of stock options, provided that the effect is dilutive.
|  | 2018 |  | 2017 |  | 2016
Basic earnings (loss) per ordinary share computation |  |  |  |  |  |
Numerator: |  |  |  |  |  |
Profit (loss) attributable to the Parent (US$'000) |  | 43,661 |  | (678) |  | (338,427)
Denominator: |  |  |  |  |  |
Weighted average basic shares outstanding |  | 171,406,272 |  | 171,949,128 |  | 171,838,153
Basic earnings (loss) per ordinary share (US$) |  | 0.25 |  | — |  | (1.97)
Diluted earnings (loss) per ordinary share computation |  |  |  |  |  |
Numerator: |  |  |  |  |  |
Profit (loss) attributable to the Parent (US$'000) |  | 43,661 |  | (678) |  | (338,427)
Denominator: |  |  |  |  |  |
Weighted average basic shares outstanding |  | 171,406,272 |  | 171,949,128 |  | 171,838,153
Effect of dilutive securities |  | 123,340 |  | — |  | —
Weighted average dilutive shares outstanding |  | 171,529,612 |  | 171,949,128 |  | 171,838,153
Diluted earnings (loss) per ordinary share (US$) |  | 0.25 |  | — |  | (1.97)
Potential ordinary shares of 269,116, of 70,673, and of 96,236 were excluded from the calculation of diluted earnings (loss) per ordinary share in 2018, 2017, and 2016 respectively because their effect would be anti-dilutive.

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