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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Shares
Common Stock Amount
Paid-in Additional Capital
Treasury Shares
Retained Earnings
Translation Differences
Other Reserves
Total Equity
Balance at beginning of period (Restated [member]) at Dec. 31, 2017   $ 142,417,407 $ 1,424 $ 1,140,794   $ (226,821) $ 85 $ 5,676 $ 921,158
Balance at beginning of period (Previously stated [member]) at Dec. 31, 2017   142,417,407 1,424 1,140,794   (222,087) 85 5,676 925,892
Balance at beginning of period (Increase (decrease) due to changes in accounting policy required by IFRSs [member]) at Dec. 31, 2017           (4,734)     (4,734)
Net income/(loss) after tax attributable to owners of parent $ (58,910)         (58,910)     (58,910)
Other comprehensive income/(loss) (63)           (63)   (63)
Total comprehensive income/(loss) (58,974)         (58,910) (63)   (58,974)
Cash dividends declared and paid           (8,615)     (8,615)
Purchase of treasury shares 0                
Issuance of convertible bonds 39,346     3,165         3,165
Purchase of convertible bonds       (1,613)         (1,613)
Compensation related to options and restricted stock   1,175,136 12 6,414       (4,161) 2,264
Balance at end of period at Sep. 30, 2018   143,592,543 1,436 1,148,761   (294,346) 22 1,514 857,387
Balance at beginning of period at Dec. 31, 2018 861,668 142,700,046 1,427 1,145,107 $ (1,364) (285,383) 32 1,848 861,668
Net income/(loss) after tax attributable to owners of parent (2,178)         (2,178)     (2,178)
Other comprehensive income/(loss) (45)           (45)   (45)
Total comprehensive income/(loss) (2,223)         (2,178) (45)   (2,223)
Cash dividends declared and paid           (21,345)     (21,345)
Purchase of treasury shares (3,248)       (3,248)       (3,248)
Retirement of treasury shares   (1,061,241) (11) (4,602) $ 4,612       0
Issuance of convertible bonds (7)                
Compensation related to options and restricted stock   780,136 8 2,594       (725) 1,877
Balance at end of period at Sep. 30, 2019 $ 836,728 $ 142,418,941 $ 1,424 $ 1,143,100   $ (308,905) $ (13) $ 1,123 $ 836,728