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Consolidated Statements of Changes in Equity - USD ($)
shares in Thousands, $ in Thousands
Ordinary shares [member]
Additional paid-in capital [member]
Treasury shares [member]
Accumulated other Comprehensive income [member]
Effect of transition to IFRSs [member]
Accumulated other Comprehensive income [member]
Retained earnings [member]
Effect of transition to IFRSs [member]
Retained earnings [member]
Noncontrolling interests [member]
Equity attributable to owners of parent [member]
Total
Balance at Dec. 31, 2016 $ 107,010 $ 103,473 $ (9,020)   $ (1,554)   $ 266,811 $ 418 $ 466,720 $ 467,138
Balance (in shares) at Dec. 31, 2016 356,700   (12,693)              
IFRS Statement [Line Items]                    
Profit (loss) for the year             27,680 (2,142) 27,680 25,538
Other comprehensive income         1,108     (5) 1,108 1,103
Total comprehensive income for the year         1,108   27,680 (2,147) 28,788 26,641
Contributions by and distributions to owners                    
Declaration of cash dividends             (41,281)   (41,281) (41,281)
Share-based compensation expenses   945           52 945 997
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   803 $ 142       (41,281) 52 (40,336) (40,284)
Changes in ownership interests                    
New shares issued by subsidiary   130           (25) 130 105
Dilution gain of equity method investment   26             26 26
Sale (purchase) of subsidiary shares to (from) noncontrolling interests   (5)           (33) (5) (38)
Transfer of financial liability to noncontrolling interests                   0
Aggregate of Changes in Ownership Interests   151           (58) 151 93
Balance at Dec. 31, 2017 $ 107,010 104,427 $ (8,878)   (446)   253,210 (1,735) 455,323 453,588
Balance (in shares) at Dec. 31, 2017 356,700   (12,492)              
IFRS Statement [Line Items]                    
Effect of adopting IFRS 9       $ (193)   $ 193        
Profit (loss) for the year             8,569 (2,543) 8,569 6,026
Other comprehensive income         90     5 90 95
Total comprehensive income for the year         (103)   8,762 (2,538) 8,659 6,121
Contributions by and distributions to owners                    
Declaration of cash dividends             (17,210)   (17,210) (17,210)
Share-based compensation expenses   386           22 386 408
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   327 $ 59       (17,210) 22 (16,824) (16,802)
Changes in ownership interests                    
New shares issued by subsidiary   21           (10) 21 11
Dilution gain of equity method investment   (26)         (605)   (631) (631)
Transfer of financial liability to noncontrolling interests                   0
Aggregate of Changes in Ownership Interests   (5)         (605) (10) (610) (620)
Balance at Dec. 31, 2018 $ 107,010 104,749 $ (8,819)   (549)   244,157 (4,261) 446,548 442,287
Balance (in shares) at Dec. 31, 2018 356,700   (12,409)              
IFRS Statement [Line Items]                    
Profit (loss) for the year             (13,614) (2,570) (13,614) (16,184)
Other comprehensive income         (403)     12 (403) (391)
Total comprehensive income for the year         (403)   (13,614) (2,558) (14,017) (16,575)
Contributions by and distributions to owners                    
Share-based compensation expenses   452           5 452 457
Restricted stock vested (in shares)     77              
Restricted stock vested   (55) $ 55              
Aggregate of contribution by distribution to owners (in shares)     77              
Aggregate of contribution by distribution to owners   397 $ 55         5 452 457
Changes in ownership interests                    
Dilution gain of equity method investment   4             4 4
Transfer of financial liability to noncontrolling interests               5,071   5,071
Aggregate of Changes in Ownership Interests   4           5,071 4 5,075
Balance at Dec. 31, 2019 $ 107,010 $ 105,150 $ (8,764)   $ (952)   $ 230,543 $ (1,743) $ 432,987 $ 431,244
Balance (in shares) at Dec. 31, 2019 356,700   (12,332)