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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]
Accumulated Other Comprehensive Income (Loss), Net of Deferred Income Taxes [Member]
Cumulative Effect Period Of Adoption Adjustment [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect Period Of Adoption Adjustment [Member]
Treasury Stock [Member]
Balance at Dec. 31, 2017     $ 691 $ 2,165,768 $ (160,891)   $ 9,657,412   $ (3,322,244)
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2017                
Balance (Accounting Standards Update 2016-01 [Member]) at Dec. 31, 2017           $ (1,201)   1,201  
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 ($6.20 per share 2020,$5.75 per share 2019 and $5.30 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 (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2018                
Balance (Accounting Standards Update 2016-01 [Member]) at Dec. 31, 2018              
Balance, shares at Dec. 31, 2018   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 ($6.20 per share 2020,$5.75 per share 2019 and $5.30 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 (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019               (4,214)  
Balance (Accounting Standards Update 2016-01 [Member]) at Dec. 31, 2019              
Balance, shares at Dec. 31, 2019 69,464,000 40,798,963              
Issued during the period, net, shares   155,410              
Treasury shares acquired, shares   (970,892)              
Issued during the period, net     2            
Share-based compensation plans       25,641          
Net increase (decrease) during the period $ 506,746       506,746        
Net income (loss) 514,151           514,151    
Dividends declared ($6.20 per share 2020,$5.75 per share 2019 and $5.30 per share in 2018) (249,056)           (249,056)    
Purchase of treasury shares                 (200,020)
Balance at Dec. 31, 2020 $ 9,726,176   $ 696 $ 2,245,301 $ 534,899   $ 10,567,452   $ (3,622,172)
Balance, shares at Dec. 31, 2020 69,620,000 39,983,481