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Assets held for sale and discontinued operations - Summarized operating results for discontinued operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating results      
Revenue $ 0 $ 0 $ 0
Earnings before tax, gain on sale and impairment 122 1,032 (1,534)
Earnings before tax 122 1,032 (1,534)
Net earnings from discontinued operations 122 1,032 (1,534)
Ubud Hanging Gardens      
Operating results      
Revenue 0 0 0
Earnings before tax, gain on sale and impairment 100 69 (636)
Earnings before tax 100 69 (636)
Net earnings from discontinued operations 100 69 (636)
Porto Cupecoy      
Operating results      
Revenue 0 0 0
Earnings before tax, gain on sale and impairment 22 963 (898)
Earnings before tax 22 963 (898)
Net earnings from discontinued operations $ 22 $ 963 $ (898)