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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]
Balance at Dec. 31, 2016           $ 9,380,653  
Net income (loss) $ 482,751         482,751  
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) 1,201  
Issued during the period, net, shares   143,362          
Treasury shares acquired, shares            
Issued during the period, net     1        
Share-based compensation plans       (2,249)      
Net increase (decrease) during the period         (179,882)    
Net income (loss) 215,186         215,186  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)           (53,240)  
Purchase of treasury shares            
Balance at Mar. 31, 2018 8,320,552   692 2,163,519 (341,974) 9,820,559 (3,322,244)
Balance, shares at Mar. 31, 2018   40,978,634          
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   692 2,172,701 (445,338) 9,828,106 (3,347,548)
Balance, shares at Jun. 30, 2018   40,860,169          
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 increase (decrease) during the period (308,225)            
Net income (loss) 474,354         474,354  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) (159,343)            
Balance at Sep. 30, 2018 8,289,045   692 2,182,594 (470,317) 9,973,624 (3,397,548)
Balance, shares at Sep. 30, 2018   40,647,125          
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) 89,041         89,041  
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   692 2,163,519 (341,974) 9,820,559 (3,322,244)
Balance, shares at Mar. 31, 2018   40,978,634          
Issued during the period, net, shares   (5,718)          
Treasury shares acquired, shares   (112,747)          
Issued during the period, net            
Share-based compensation plans       9,182      
Net increase (decrease) during the period         (103,364)    
Net income (loss) 60,787         60,787  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)           (53,240)  
Purchase of treasury shares             (25,304)
Balance at Jun. 30, 2018 8,208,613   692 2,172,701 (445,338) 9,828,106 (3,347,548)
Balance, shares at Jun. 30, 2018   40,860,169          
Issued during the period, net, shares   16,388          
Treasury shares acquired, shares   (229,432)          
Issued during the period, net            
Share-based compensation plans       9,893      
Net increase (decrease) during the period (24,979)       (24,979)    
Net income (loss) 198,381         198,381  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) (52,863)         (52,863)  
Purchase of treasury shares             (50,000)
Balance at Sep. 30, 2018 8,289,045   692 2,182,594 (470,317) 9,973,624 (3,397,548)
Balance, shares at Sep. 30, 2018   40,647,125          
Change to beginning balance due to adoption of Accounting Standards Update 2016-01          
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   194,584          
Treasury shares acquired, shares   (75,193)          
Issued during the period, net     2        
Share-based compensation plans       767      
Net increase (decrease) during the period         246,446    
Net income (loss) $ 354,551         354,551  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)           (57,137)  
Purchase of treasury shares             (16,153)
Balance at Mar. 31, 2019 8,389,273   694 2,189,544 (216,111) 9,828,847 (3,413,701)
Balance, shares at Mar. 31, 2019   40,770,539          
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   694 2,198,461 (44,902) 10,104,716 (3,422,152)
Balance, shares at Jun. 30, 2019   40,740,502          
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 increase (decrease) during the period $ 508,828            
Net income (loss) 791,817            
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) (171,131)            
Balance at Sep. 30, 2019 $ 8,983,258   694 2,206,326 46,272 10,152,118 (3,422,152)
Balance, shares at Sep. 30, 2019 69,406,000 40,780,469          
Balance at Mar. 31, 2019 $ 8,389,273   694 2,189,544 (216,111) 9,828,847 (3,413,701)
Balance, shares at Mar. 31, 2019   40,770,539          
Issued during the period, net, shares   9,403          
Treasury shares acquired, shares   (39,440)          
Issued during the period, net            
Share-based compensation plans       8,917      
Net increase (decrease) during the period         171,209    
Net income (loss) 332,868         332,868  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)           (56,999)  
Purchase of treasury shares             (8,451)
Balance at Jun. 30, 2019 8,836,817   694 2,198,461 (44,902) 10,104,716 (3,422,152)
Balance, shares at Jun. 30, 2019   40,740,502          
Issued during the period, net, shares   39,967          
Treasury shares acquired, shares   0          
Issued during the period, net            
Share-based compensation plans       7,865      
Net increase (decrease) during the period 91,173       91,174    
Net income (loss) 104,398         104,398  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) (56,995)         (56,995)  
Purchase of treasury shares            
Balance at Sep. 30, 2019 $ 8,983,258   $ 694 $ 2,206,326 $ 46,272 $ 10,152,118 $ (3,422,152)
Balance, shares at Sep. 30, 2019 69,406,000 40,780,469