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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 $ 1,201       $ (1,201) $ 1,201  
Balance, beginning of period at Dec. 31, 2017     $ 691 $ 2,165,768 (160,891) 9,685,908 $ (3,322,244)
Balance, beginning of period, shares at Dec. 31, 2017   40,835,272          
Issued during the period, net, shares   143,362          
Treasury shares acquired, shares   0          
Issued during the period, net     1        
Share-based compensation plans       (2,249)      
Net increase (decrease) during the period         (179,882)    
Net income (loss)           210,318  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)           (53,240)  
Purchase of treasury shares             0
Balance, end of period at Mar. 31, 2018     692 2,163,519 (341,974) 9,844,187 (3,322,244)
Balance, end of period, shares at Mar. 31, 2018   40,978,634          
Balance, beginning of period at Dec. 31, 2017     691 2,165,768 (160,891) 9,685,908 (3,322,244)
Balance, beginning of period, shares at Dec. 31, 2017   40,835,272          
Net increase (decrease) during the period (283,246)            
Net income (loss) 280,213            
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) (106,480)            
Balance, end of period at Jun. 30, 2018 8,241,349   692 2,172,701 (445,338) 9,860,842 (3,347,548)
Balance, end of period, shares at Jun. 30, 2018   40,860,169          
Balance, beginning of period at Mar. 31, 2018     692 2,163,519 (341,974) 9,844,187 (3,322,244)
Balance, beginning of period, 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     0        
Share-based compensation plans       9,182      
Net increase (decrease) during the period (103,364)       (103,364)    
Net income (loss) 69,895         69,895  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) (53,240)         (53,240)  
Purchase of treasury shares             (25,304)
Balance, end of period at Jun. 30, 2018 8,241,349   692 2,172,701 (445,338) 9,860,842 (3,347,548)
Balance, end of period, shares at Jun. 30, 2018   40,860,169          
Change to beginning balance due to adoption of Accounting Standards Update 2016-01         0 0  
Balance, beginning of period at Dec. 31, 2018 $ 7,903,804 $ 692   2,188,777   9,574,440 (3,397,548)
Balance, beginning of period, 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)           348,900  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018)           (57,137)  
Purchase of treasury shares             (16,153)
Balance, end of period at Mar. 31, 2019   $ 694   2,189,544 (216,111) 9,866,203 (3,413,701)
Balance, end of period, shares at Mar. 31, 2019   40,770,539          
Balance, beginning of period at Dec. 31, 2018 $ 7,903,804 $ 692   2,188,777   9,574,440 (3,397,548)
Balance, beginning of period, shares at Dec. 31, 2018 69,202,000 40,651,148          
Net increase (decrease) during the period $ 417,655            
Net income (loss) 691,755            
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) (114,136)            
Balance, end of period at Jun. 30, 2019 $ 8,884,160 $ 694   2,198,461 (44,902) 10,152,059 (3,422,152)
Balance, end of period, shares at Jun. 30, 2019 69,406,000 40,740,502          
Balance, beginning of period at Mar. 31, 2019   $ 694   2,189,544 (216,111) 9,866,203 (3,413,701)
Balance, beginning of period, 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     $ 0        
Share-based compensation plans       8,917      
Net increase (decrease) during the period $ 171,209       171,209    
Net income (loss) 342,855         342,855  
Dividends declared ($1.40 per share in 2019 and $1.30 per share in 2018) (56,999)         (56,999)  
Purchase of treasury shares             (8,451)
Balance, end of period at Jun. 30, 2019 $ 8,884,160 $ 694   $ 2,198,461 $ (44,902) $ 10,152,059 $ (3,422,152)
Balance, end of period, shares at Jun. 30, 2019 69,406,000 40,740,502