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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, 2014 $ 2,075,108 $ 53,486 $ (18,426) $ 2,011,485 $ 238 $ 20,859 $ 7,466
Beginning balance (Increase (decrease) due to corrections of prior period errors [member]) at Dec. 31, 2014 (181,242)     (181,242)      
Beginning balance at Dec. 31, 2014 1,893,866 53,486 (18,426) 1,830,243 238 $ 20,859 $ 7,466
Beginning balance, shares (Previously stated [member]) at Dec. 31, 2014           33,050,298 10,938,125
Beginning balance, shares at Dec. 31, 2014           33,050,298 10,938,125
Net income (loss) | Increase (decrease) due to corrections of prior period errors [member] (15,660)            
Net income (loss) (240,634)     (240,634)      
Other comprehensive income (1,006)       (1,006)    
Issuance of stock for employee awards   (65)       $ 65  
Issuance of stock for employee awards, shares           94,704  
Share-based compensation expense 4,034 4,034          
Repurchase of treasury shares (117,962)   (117,962)        
Repurchase of treasury shares, shares           (2,127,900)  
Dividends paid (147,592)     (147,592)      
Other (186)     (186)      
Ending balance at Dec. 31, 2015 1,390,520 57,455 (136,388) 1,441,831 (768) $ 20,924 $ 7,466
Ending balance, shares at Dec. 31, 2015           31,017,102 10,938,125
Net income (loss) | Increase (decrease) due to corrections of prior period errors [member] (8,616)            
Net income (loss) 325,928     325,928      
Other comprehensive income (1,104)       (1,104)    
Issuance of stock for employee awards   (64)       $ 64  
Issuance of stock for employee awards, shares           94,208  
Share-based compensation expense 7,539 7,539          
Dividends paid (86,116)     (86,116)      
Other (14) 56   (70)      
Other, shares           1,046  
Ending balance (Increase (decrease) due to corrections of prior period errors [member]) at Dec. 31, 2016 (205,518)            
Ending balance at Dec. 31, 2016 1,636,753 64,986 (136,388) 1,681,573 (1,872) $ 20,988 $ 7,466
Ending balance, shares at Dec. 31, 2016           31,112,356 10,938,125
Net income (loss) | Increase (decrease) due to corrections of prior period errors [member] (365)            
Net income (loss) 369,658     369,658      
Other comprehensive income (2,016)       (2,016)    
Issuance of stock for employee awards   (42)       $ 42  
Issuance of stock for employee awards, shares           62,224  
Share-based compensation expense 7,422 7,422          
Dividends paid (106,792)     (106,792)      
Share options exercised 587 579       $ 8  
Share options exercised, shares           11,061  
Ending balance (Increase (decrease) due to corrections of prior period errors [member]) at Dec. 31, 2017 (205,883)            
Ending balance at Dec. 31, 2017 $ 1,905,612 $ 72,945 $ (136,388) $ 1,944,439 $ (3,888) $ 21,038 $ 7,466
Ending balance, shares at Dec. 31, 2017           31,185,641 10,938,125