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Consolidated statement of changes in equity - USD ($)
$ in Thousands
Total
Additional paid in capital [member]
Treasury stock [member]
Retained earnings [member]
Accumulated other comprehensive income (loss) [member]
Class A common stock [member]
Class B common stock [member]
Beginning balance (Previously stated [member]) at Dec. 31, 2017 $ 1,850,938 $ 72,945 $ (136,388) $ 1,889,765 $ (3,888) $ 21,038 $ 7,466
Adjustment on initial application of IFRS 9 (1,744)     (1,744)      
Beginning balance, shares (Previously stated [member]) at Dec. 31, 2017           31,185,641 10,938,125
Net profit (loss) 88,198     88,198      
Other comprehensive loss (339)       (339)    
Issuance of stock for employee awards   (49)       $ 49  
Issuance of stock for employee awards, shares           72,045  
Share-based compensation expense 7,145 7,145          
Dividends paid (147,604)     (147,604)      
Ending balance at Dec. 31, 2018 1,796,594 80,041 (136,388) 1,828,615 (4,227) $ 21,087 $ 7,466
Ending balance, shares at Dec. 31, 2018           31,257,686 10,938,125
Net profit (loss) 247,002     247,002      
Other comprehensive loss (4,401)       (4,401)    
Issuance of stock for employee awards   (55)       $ 55  
Issuance of stock for employee awards, shares           80,170  
Share-based compensation expense 6,149 6,149          
Dividends paid (110,438)     (110,438)      
Ending balance at Dec. 31, 2019 1,934,906 86,135 (136,388) 1,965,179 (8,628) $ 21,142 $ 7,466
Ending balance, shares at Dec. 31, 2019           31,337,856 10,938,125
Net profit (loss) (607,062)     (607,062)      
Other comprehensive loss (15,454)       (15,454)    
Issuance of stock for employee awards   (57)       $ 57  
Issuance of stock for employee awards, shares           83,409  
Share-based compensation expense 5,263 5,263          
Dividends paid (33,990)     (33,990)      
Other (105)     (105)      
Ending balance at Dec. 31, 2020 $ 1,283,558 $ 91,341 $ (136,388) $ 1,324,022 $ (24,082) $ 21,199 $ 7,466
Ending balance, shares at Dec. 31, 2020           31,421,265 10,938,125