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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]
Retained Earnings [Member]
Cumulative Effect Period Of Adoption Adjustment [Member]
Treasury Stock [Member]
Balance at Dec. 31, 2019     $ 694 $ 2,219,660 $ 28,152 $ 10,306,571   $ (3,422,152)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019             $ (4,214)  
Balance, shares at Dec. 31, 2019   40,798,963            
Issued during the period, net, shares   159,423            
Treasury shares acquired, shares   (970,892)            
Issued during the period, net     2          
Share-based compensation plans       (3,181)        
Net increase (decrease) during the period         (297,903)      
Net income (loss)           16,612    
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020)           (63,277)    
Purchase of treasury shares               (200,020)
Balance at Mar. 31, 2020     696 2,216,479 (269,751) 10,255,692   (3,622,172)
Balance, shares at Mar. 31, 2020   39,987,494            
Balance at Dec. 31, 2019     694 2,219,660 28,152 10,306,571   (3,422,152)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019             (4,214)  
Balance, shares at Dec. 31, 2019   40,798,963            
Net increase (decrease) during the period $ 268,984              
Net income (loss) 207,492              
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020) (125,205)              
Balance at Jun. 30, 2020 9,286,299   696 2,225,993 297,137 10,384,645   (3,622,172)
Balance, shares at Jun. 30, 2020   39,971,645            
Balance at Mar. 31, 2020     696 2,216,479 (269,751) 10,255,692   (3,622,172)
Balance, shares at Mar. 31, 2020   39,987,494            
Issued during the period, net, shares   (15,849)            
Treasury shares acquired, shares   0            
Issued during the period, net              
Share-based compensation plans       9,514        
Net increase (decrease) during the period 566,888       566,888      
Net income (loss) 190,880         190,880    
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020) (61,927)         (61,927)    
Purchase of treasury shares              
Balance at Jun. 30, 2020 9,286,299   696 2,225,993 297,137 10,384,645   (3,622,172)
Balance, shares at Jun. 30, 2020   39,971,645            
Balance at Dec. 31, 2020 $ 9,726,176   696 2,245,301 534,899 10,567,452   (3,622,172)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2020              
Balance, shares at Dec. 31, 2020 69,620,000 39,983,481            
Issued during the period, net, shares   196,481            
Treasury shares acquired, shares   (97,462)            
Issued during the period, net     2          
Share-based compensation plans       436        
Net increase (decrease) during the period         (299,820)      
Net income (loss)           341,862    
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020)           (62,228)    
Purchase of treasury shares               (23,545)
Balance at Mar. 31, 2021     698 2,245,737 235,079 10,847,086   (3,645,717)
Balance, shares at Mar. 31, 2021   40,082,500            
Balance at Dec. 31, 2020 $ 9,726,176   696 2,245,301 534,899 10,567,452   (3,622,172)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2020              
Balance, shares at Dec. 31, 2020 69,620,000 39,983,481            
Net increase (decrease) during the period $ (177,721)              
Net income (loss) 1,021,844              
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020) (124,274)              
Balance at Jun. 30, 2021 $ 10,416,789   698 2,256,390 357,178 11,465,022   (3,662,499)
Balance, shares at Jun. 30, 2021 69,817,000 40,015,340            
Balance at Mar. 31, 2021     698 2,245,737 235,079 10,847,086   (3,645,717)
Balance, shares at Mar. 31, 2021   40,082,500            
Issued during the period, net, shares   940            
Treasury shares acquired, shares   (68,100)            
Issued during the period, net              
Share-based compensation plans       10,653        
Net increase (decrease) during the period $ 122,099       122,099      
Net income (loss) 679,982         679,982    
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020) (62,045)         (62,046)    
Purchase of treasury shares               (16,782)
Balance at Jun. 30, 2021 $ 10,416,789   $ 698 $ 2,256,390 $ 357,178 $ 11,465,022   $ (3,662,499)
Balance, shares at Jun. 30, 2021 69,817,000 40,015,340