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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive Income
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU | Accounting Standards Update 2016-01 $ 0     $ (157) $ 157
Balance, value at Dec. 31, 2017 1,949,922 $ 1,634,705 $ 0 337,442 (22,225)
Balance (in shares) at Dec. 31, 2017   73,020      
Net income 172,882     172,882  
Other comprehensive income (13,237)       (13,237)
Issuance of common stock - stock option and other plans, shares   46      
Issuance of common stock - stock option and other plans, value 1,857 $ 1,857      
Issuance of common stock - restricted stock awards, net of canceled awards, shares   246      
Issuance of common stock - restricted stock awards, net of canceled awards, value 8,354 $ 8,354      
Activity in deferred compensation 7        
Purchase and retirement of common stock, shares   (63)      
Purchase and retirement of common stock, value (2,677) $ (2,677)      
Cash dividends declared on common stock (83,459)     (83,459)  
Balance, value at Dec. 31, 2018 $ 2,033,649 $ 1,642,246 0 426,708 (35,305)
Balance (in shares) at Dec. 31, 2018   73,249      
Common Stock, Dividends, Per Share, paid $ 1.14        
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU | Accounting Standards Update 2016-02 $ 782     782  
Net income 194,451     194,451  
Other comprehensive income 75,672       75,672
Issuance of common stock - stock option and other plans, shares   59      
Issuance of common stock - stock option and other plans, value 2,025 $ 2,025      
Issuance of common stock - restricted stock awards, net of canceled awards, shares   343      
Issuance of common stock - restricted stock awards, net of canceled awards, value 9,271 $ 9,271      
Activity in deferred compensation 3 $ 3      
Purchase and retirement of common stock, shares   (74)      
Purchase and retirement of common stock, value (2,792) $ (2,792)      
Cash dividends declared on common stock (102,265)     (102,265)  
Purchase of treasury stock, shares   1,453      
Purchase of treasury stock, value (50,834)   (50,834)    
Balance, value at Dec. 31, 2019 $ 2,159,962 $ 1,650,753 (50,834) 519,676 40,367
Balance (in shares) at Dec. 31, 2019   72,124      
Common Stock, Dividends, Per Share, paid $ 1.40        
Adjustment to opening retained earnings, net of tax, pursuant to adoption of ASU | Accounting Standards Update 2016-13 $ (2,500)     (2,457)  
Net income 154,244     154,244  
Other comprehensive income 141,828       141,828
Issuance of common stock - stock option and other plans, shares   65      
Issuance of common stock - stock option and other plans, value 2,028 $ 2,028      
Issuance of common stock - restricted stock awards, net of canceled awards, shares   208      
Issuance of common stock - restricted stock awards, net of canceled awards, value 10,737 $ 10,737      
Activity in deferred compensation 2 $ 2      
Purchase and retirement of common stock, shares   (68)      
Purchase and retirement of common stock, value (2,522) $ (2,522)      
Cash dividends declared on common stock $ (96,215)     (96,215)  
Purchase of treasury stock, shares 731 731      
Purchase of treasury stock, value $ (20,000)   (20,000)    
Balance, value at Dec. 31, 2020 $ 2,347,607 $ 1,660,998 $ (70,834) $ 575,248 $ 182,195
Balance (in shares) at Dec. 31, 2020   71,598      
Common Stock, Dividends, Per Share, paid $ 1.34