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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)       (297,903)      
Net income (loss) 16,612         16,612    
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020) (63,277)         (63,277)    
Purchase of treasury shares               (200,020)
Balance at Mar. 31, 2020 8,580,944   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, 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)       (299,820)      
Net income (loss) 341,862         341,862    
Dividends declared ($1.55 per share 2021 and $1.55 per share 2020) (62,229)         (62,228)    
Purchase of treasury shares               (23,545)
Balance at Mar. 31, 2021 $ 9,682,882   $ 698 $ 2,245,737 $ 235,079 $ 10,847,085   $ (3,645,717)
Balance, shares at Mar. 31, 2021 69,816,000 40,082,500