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Summary of significant accounting policies - Accounting policies changed during the period, Balance sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, plant and equipment, net $ 1,480,439 $ 831,377 [1] $ 814,867 [1]  
Investment property 40,725 42,342 [1] 44,581 [1]  
Deferred tax assets 16,191 30,808 [1] 25,043 [1]  
TOTAL ASSETS 2,277,372 1,645,089 [1] 1,496,397 [1]  
Retained earnings 237,188 106,209 [1] 92,997 [1]  
Cumulative translation adjustment (666,037) (552,604) [1] (533,120) [1]  
Non-controlling interest 44,509 9,139 [1] 11,970 [1]  
TOTAL SHAREHOLDERS EQUITY $ 1,108,145 683,019 [1],[2] 712,304 [1],[3] $ 564,150
Previously stated        
Property, plant and equipment, net   820,931 802,608  
Investment property   2,271 2,666  
Deferred tax assets   43,437 38,586  
TOTAL ASSETS   1,607,201 1,455,766  
Retained earnings   60,984 50,998  
Cumulative translation adjustment   (541,545) (527,364)  
Non-controlling interest   5,417 7,582  
TOTAL SHAREHOLDERS EQUITY   645,131 671,673  
Increase/ (Decrease)        
Property, plant and equipment, net   10,446 12,259  
Investment property   40,071 41,915  
Deferred tax assets   (12,629) (13,543)  
TOTAL ASSETS   37,888 40,631  
Retained earnings   45,225 41,999  
Cumulative translation adjustment   (11,059) (5,756)  
Non-controlling interest   3,722 4,388  
TOTAL SHAREHOLDERS EQUITY   $ 37,888 $ 40,631  
[1] Prior periods have been recast to reflect the Company's change in accounting policy for Investment properties as in Note 33.
[2] 2017 information has been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.
[3] 2016 information has been recast to reflect the Company's change in accounting policy for Investment properties as described in Note 33.