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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 Interest [Member]
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 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) (725,298) 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 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
Purchase of treasury shares (in shares) 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            
Changes in equity                
Profit for the year (11,507) $ 0 0 0 (11,521) 0 0 14
Other comprehensive income/(loss) (160) 0 0 0 (92) (68) 0 0
Total comprehensive income/(loss) for the period net of tax (11,667) 0 0 0 (11,613) (68) 0 14
Cash dividends declared and paid (22,083) 0 0 0 (22,083) 0 0 0
Purchase of treasury shares $ (32,178) $ 0 0 (32,178) 0 0 0 0
Purchase of treasury shares (in shares) (5,513,254) 0            
Retirement of treasury shares $ 0 $ (55) (32,123) 32,178 0 0 0 0
Retirement of treasury shares (in shares)   (5,513,254)            
Compensation related to options and restricted stock 4,347 $ 8 4,619 0 0 0 (280) 0
Compensation related to options and restricted stock (in shares)   841,696            
Balance at Dec. 31, 2021 $ 1,047,359 $ 1,661 $ 1,264,000 $ 0 $ (222,405) $ 101 $ 3,968 $ 34
Balance (in shares) at Dec. 31, 2021   166,126,770            
[1] Other reserves are related to share-based payments.