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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Parent [member]
Ordinary shares [member]
Additional paid-in capital [member]
Treasury shares [member]
Accumulated other Comprehensive income [member]
Accumulated other Comprehensive income [member]
Effect of transition to IFRSs [member]
Retained earnings [member]
Retained earnings [member]
Effect of transition to IFRSs [member]
Noncontrolling interests [member]
Balance at Jan. 01, 2017 $ 467,138 $ 466,720 $ 107,010 $ 103,473 $ (9,020) $ (1,554)   $ 266,811   $ 418
Balance (in shares) at Jan. 01, 2017     356,700   (12,693)          
Profit (loss) for the year 25,538 27,680           27,680   (2,142)
Other comprehensive income 1,103 1,108       1,108       (5)
Total comprehensive income for the year 26,641 28,788       1,108   27,680   (2,147)
Contributions by and distributions to owners                    
Declaration of cash dividends (41,281) (41,281)           (41,281)    
Share-based compensation expenses 997 945   945           52
Restricted stock vested (in shares)         201          
Restricted stock vested       (142) $ 142          
Aggregate of contribution by distribution to owners (in shares)         201          
Aggregate of contribution by distribution to owners (40,284) (40,336)   803 $ 142     (41,281)   52
Changes in ownership interests                    
Dilution gain of equity method investment 26 26   26            
New shares issued by subsidiary 105 130   130           (25)
Sale (purchase) of subsidiary shares to (from) noncontrolling interests (38) (5)   (5)           (33)
Aggregate of Changes in Ownership Interests 93 151   151           (58)
Balance at Dec. 31, 2017 453,588 455,323 $ 107,010 104,427 $ (8,878) (446)   253,210   (1,735)
Balance (in shares) at Dec. 31, 2017     356,700   (12,492)          
Effect of adopting IFRS 9             $ (193)   $ 193  
Profit (loss) for the year 6,026 8,569           8,569   (2,543)
Other comprehensive income 95 90       90       5
Total comprehensive income for the year 6,121 8,659       (103)   8,762   (2,538)
Contributions by and distributions to owners                    
Declaration of cash dividends (17,210) (17,210)           (17,210)    
Share-based compensation expenses 408 386   386           22
Restricted stock vested (in shares)         83          
Restricted stock vested       (59) $ 59          
Aggregate of contribution by distribution to owners (in shares)         83          
Aggregate of contribution by distribution to owners (16,802) (16,824)   327 $ 59     (17,210)   22
Changes in ownership interests                    
Dilution gain of equity method investment (631) (631)   (26)       (605)    
New shares issued by subsidiary 11 21   21           (10)
Aggregate of Changes in Ownership Interests (620) (610)   (5)       (605)   (10)
Balance at Dec. 31, 2018 $ 442,287 $ 446,548 $ 107,010 $ 104,749 $ (8,819) $ (549)   $ 244,157   $ (4,261)
Balance (in shares) at Dec. 31, 2018     356,700   (12,409)