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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Paid-in Additional Capital [Member]
Treasury Shares [Member]
Retained Earnings [Member]
Translation Differences [Member]
Other Reserves [Member]
 [1]
Non-controlling Interests [Member]
Balance (Restatement Adjustment [Member]) at Dec. 31, 2017 $ 921,158 $ 1,424 $ 1,140,794 $ 0 $ (226,821) $ 85 $ 5,676 $ 0
Balance (Impact of transition of IFRS 15 [Member]) at Dec. 31, 2017 (4,734) 0 0 0 (4,734) 0 0 0
Balance at Dec. 31, 2017 925,892 $ 1,424 1,140,794 0 (222,087) 85 5,676 0
Balance (in shares) (Restatement Adjustment [Member]) at Dec. 31, 2017   142,417,407            
Balance (in shares) at Dec. 31, 2017   142,417,407            
Changes in equity                
Profit/(loss) for the year (46,927) $ 0 0 0 (46,927) 0 0 0
Other comprehensive income/(loss) (201) 0 0 0 (148) (53) 0 0
Total comprehensive income/(loss) for the period net of tax (47,128) 0 0 0 (47,075) (53) 0 0
Cash dividends declared and paid (11,487) 0 0 0 (11,487) 0 0 0
Purchase of treasury shares (5,026) $ 0 0 (5,026) 0 0 0 0
Purchase of treasury shares (in shares)   0            
Retirement of treasury shares 0 $ (9) (3,654) 3,662 0 0 0 0
Retirement of treasury shares (in shares)   (892,497)            
Issuance of convertible bonds 3,165 $ 0 3,165 0 0 0 0 0
Purchase of convertible bonds (1,613) 0 (1,613) 0 0 0 0 0
Compensation related to options and restricted stock 2,599 $ 12 6,414 0 0 0 (3,827) 0
Compensation related to options and restricted stock (in shares)   1,175,136            
Balance at Dec. 31, 2018 861,668 $ 1,427 1,145,107 (1,364) (285,383) 32 1,848 0
Balance (in shares) at Dec. 31, 2018   142,700,046            
Changes in equity                
Profit/(loss) for the year 73,680 $ 0 0 0 73,679 0 0 2
Other comprehensive income/(loss) 265 0 0 0 224 42 0 0
Total comprehensive income/(loss) for the period net of tax 73,946 0 0 0 73,903 42 0 2
Cash dividends declared and paid (28,685) 0 0 0 (28,685) 0 0 0
Purchase of treasury shares (3,248) $ 0 0 (3,248) 0 0 0 0
Purchase of treasury shares (in shares)   0            
Retirement of treasury shares 0 $ (11) (4,602) 4,612 0 0 0 0
Retirement of treasury shares (in shares)   (1,061,241)            
Adjustment related to non-controlling interest 3 $ 0 0 0 0 0 0 3
Conversion of convertible bonds 26,435 $ 44 26,391 0 0 0 0 0
Conversion of convertible bonds (in shares)   4,390,025            
Compensation related to options and restricted stock 2,331 $ 8 2,640 0 0 0 (317) 0
Compensation related to options and restricted stock (in shares)   790,571            
Balance at Dec. 31, 2019 932,449 $ 1,468 1,169,537 0 (240,165) 73 1,531 5
Balance (in shares) at Dec. 31, 2019   146,819,401            
Changes in equity                
Profit/(loss) for the year 266,281 $ 0 0 0 266,266 0 0 14
Other comprehensive income/(loss) (45) 0 0 0 (141) 95 0 0
Total comprehensive income/(loss) for the period net of tax 266,235 0 0 0 266,125 95 0 14
Cash dividends declared and paid (214,669) 0 0 0 (214,669) 0 0 0
Conversion of convertible bonds 119,818 $ 234 119,584 0 0 0 0 0
Conversion of convertible bonds (in shares)   23,377,397            
Compensation related to options and restricted stock 5,106 $ 6 2,383 0 0 0 2,717 0
Compensation related to options and restricted stock (in shares)   601,530            
Balance at Dec. 31, 2020 $ 1,108,940 $ 1,708 $ 1,291,505 $ 0 $ (188,709) $ 169 $ 4,248 $ 19
Balance (in shares) at Dec. 31, 2020   170,798,328            
[1] Other reserves are related to share-based payments.