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Earnings (loss) per ordinary share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:      
Profit (loss) attributable to the Parent (US$'000) $ 43,661 $ (678) [1] $ (338,427) [1]
Denominator:      
Weighted average basic shares outstanding 171,406,272 171,949,128 [1] 171,838,153 [1]
Basic earnings (loss) per ordinary share (US$) $ 0.25 $ 0.00 [1] $ (1.97) [1]
Numerator:.      
Profit (loss) attributable to the Parent (US$'000) $ 43,661 $ (678) [1] $ (338,427) [1]
Denominator:.      
Weighted average basic shares outstanding 171,406,272 171,949,128 [1] 171,838,153 [1]
Effect of dilutive securities 123,340.00 0 0
Weighted average dilutive shares outstanding 171,529,612 171,949,128 [1] 171,838,153 [1]
Diluted earnings (loss) per ordinary share (US$) $ 0.25 $ 0.00 [1] $ (1.97) [1]
[1] The amounts for 2016 have been re-presented to show the results of the Spanish energy business within profit (loss) from continuing operations, as described in Note 1 to the consolidated financial statements.