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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Share Capital
Treasury Shares
Additional Paid-in Capital
Contributed Surplus
Accumulated Other Comprehensive Loss
Retained Earnings (Losses)
Non-controlling Interests
Balance at beginning of the period at Dec. 31, 2014 $ 2,237,422 $ 93,415   $ 1,307,087 $ 200,000 $ (6,579) $ 641,844 $ 1,655
Increase (Decrease) in Stockholders' Equity                
Net loss (151,988)           (171,146) 19,158
Dividends (161,824)           (161,824)  
Exercise of share options 225 132   93        
Grant of share options 6,358     6,358        
Forfeiture of share options (2,521)     (2,521)        
Cancellation of share options 786     786        
Transfer of additional paid-in capital 1,579     6,003   (4,424)    
Other comprehensive income (loss) (1,589)         (1,589)    
Treasury shares (12,269)   $ (12,269)          
Balance at end of the period at Dec. 31, 2015 1,916,179 93,547 (12,269) 1,317,806 200,000 (12,592) 308,874 20,813
Increase (Decrease) in Stockholders' Equity                
Net loss (160,780)           (186,531) 25,751
Dividends (18,693)           (18,693)  
Exercise of share options 1,435 59   1,376        
Grant of share options 7,865     7,865        
Forfeiture of share options (892)     (892)        
Net proceeds from issuance of shares 169,876 7,475   162,401        
Other comprehensive income (loss) 3,050         3,050    
Treasury shares (8,214)   (8,214)          
Balance at end of the period at Dec. 31, 2016 1,909,826 101,081 (20,483) 1,488,556 200,000 (9,542) 103,650 46,564
Increase (Decrease) in Stockholders' Equity                
Net loss (145,279)           (179,703) 34,424
Dividends (19,689)           (19,689)  
Exercise of share options (1,166) 38   (1,204)        
Grant of share options 11,098     11,098        
Forfeiture of share options (120)     (120)        
Other comprehensive income (loss) 1,773         1,773    
Issuance of convertible bonds 39,861     39,861        
Balance at end of the period at Dec. 31, 2017 $ 1,796,304 $ 101,119 $ (20,483) $ 1,538,191 $ 200,000 $ (7,769) $ (95,742) $ 80,988