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Consolidated Statements Of Changes In Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock Outstanding [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Change to beginning balance due to adoption of Accounting Standards Update 2016-01         $ (1,250) $ 1,250  
Balance at Dec. 31, 2016     $ 689 $ 2,140,783 (216,764) 9,380,653 $ (3,272,244)
Balance, shares at Dec. 31, 2016   40,898,864          
Issued during the period, net, shares   172,901          
Treasury shares acquired, shares   (236,493)          
Issued during the period, net     2        
Share-based compensation plans       24,985      
Net increase (decrease) during the period $ 57,123       57,123    
Net income (loss) 482,751         482,751  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) (207,242)         (207,242)  
Purchase of treasury shares             (50,000)
Balance at Dec. 31, 2017 8,340,736   691 2,165,768 (160,891) 9,657,412 (3,322,244)
Balance, shares at Dec. 31, 2017   40,835,272          
Change to beginning balance due to adoption of Accounting Standards Update 2016-01         (1,201) 1,201  
Net income (loss) 215,186         215,186  
Balance at Mar. 31, 2018 8,320,552         9,820,559  
Balance at Dec. 31, 2017 8,340,736   691 2,165,768 (160,891) 9,657,412 (3,322,244)
Balance, shares at Dec. 31, 2017   40,835,272          
Net income (loss) 275,973         275,973  
Balance at Jun. 30, 2018 8,208,613         9,828,106  
Balance at Dec. 31, 2017 8,340,736   691 2,165,768 (160,891) 9,657,412 (3,322,244)
Balance, shares at Dec. 31, 2017   40,835,272          
Net income (loss) 474,354         474,354  
Balance at Sep. 30, 2018 8,289,045         9,973,624  
Balance at Dec. 31, 2017 8,340,736   691 2,165,768 (160,891) 9,657,412 (3,322,244)
Balance, shares at Dec. 31, 2017   40,835,272          
Issued during the period, net, shares   158,055          
Treasury shares acquired, shares   (342,179)          
Issued during the period, net     1        
Share-based compensation plans       23,009      
Net increase (decrease) during the period (300,465)       (300,465)    
Net income (loss) 89,041         89,041  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) (216,221)         (216,221)  
Purchase of treasury shares             (75,304)
Balance at Dec. 31, 2018 $ 7,860,797   692 2,188,777 (462,557) 9,531,433 (3,397,548)
Balance, shares at Dec. 31, 2018 69,202,000 40,651,148          
Balance at Mar. 31, 2018 $ 8,320,552         9,820,559  
Net income (loss) 60,787         60,787  
Balance at Jun. 30, 2018 8,208,613         9,828,106  
Net income (loss) 198,381         198,381  
Balance at Sep. 30, 2018 8,289,045         9,973,624  
Net income (loss) (385,313)            
Balance at Dec. 31, 2018 $ 7,860,797   692 2,188,777 (462,557) 9,531,433 (3,397,548)
Balance, shares at Dec. 31, 2018 69,202,000 40,651,148          
Change to beginning balance due to adoption of Accounting Standards Update 2016-01          
Net income (loss) $ 354,551         354,551  
Balance at Mar. 31, 2019 8,389,273         9,828,847  
Balance at Dec. 31, 2018 $ 7,860,797   692 2,188,777 (462,557) 9,531,433 (3,397,548)
Balance, shares at Dec. 31, 2018 69,202,000 40,651,148          
Net income (loss) $ 687,419            
Balance at Jun. 30, 2019 8,836,817         10,104,716  
Balance at Dec. 31, 2018 $ 7,860,797   692 2,188,777 (462,557) 9,531,433 (3,397,548)
Balance, shares at Dec. 31, 2018 69,202,000 40,651,148          
Issued during the period, net, shares   262,448          
Treasury shares acquired, shares   (114,633)          
Issued during the period, net     2        
Share-based compensation plans       30,883      
Net increase (decrease) during the period $ 490,709       490,709    
Net income (loss) 1,009,461         1,009,461  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) (234,322)         (234,322)  
Purchase of treasury shares             (24,604)
Balance at Dec. 31, 2019 $ 9,132,925   $ 694 $ 2,219,660 $ 28,152 10,306,571 $ (3,422,152)
Balance, shares at Dec. 31, 2019 69,464,000 40,798,963          
Balance at Mar. 31, 2019 $ 8,389,273         9,828,847  
Net income (loss) 332,868         332,868  
Balance at Jun. 30, 2019 $ 8,836,817         $ 10,104,716