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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]
Accumulated Deficit [Member]
Translation Differences [Member]
Other Reserves [Member]
 [1]
Non-controlling Interests [Member]
Balance at Dec. 31, 2016 $ 685,011 $ 934 $ 881,097 $ 0 $ (205,099) $ (203) $ 8,283 $ 0
Balance (in shares) at Dec. 31, 2016   93,433,804            
Changes in equity                
Profit/(loss) for the year 6,602 $ 0 0 0 6,602 0 0  
Other comprehensive income/(loss) 27 0 0 0 (166) 193 0 0
Total comprehensive income/(loss) 6,628 0 0 0 6,435 193 0 0
Adjustment 0 0 0 0 (95) 95 0 0
Cash dividends declared and paid (23,328) 0 0 0 (23,328) 0 0 0
Issuance of stock 254,845 $ 477 254,367 0 0 0 0 0
Issuance of stock (in shares)   47,724,395            
Purchase of convertible bonds (2,213) $ 0 (2,213) 0 0 0 0 0
Compensation related to options and restricted stock 4,948 $ 13 7,543 0 0 0 (2,607) 0
Compensation related to options and restricted stock (in shares)   1,259,208            
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) (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) 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            
[1] Other reserves are related to share-based payments.