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Consolidated Statements of Changes in Shareholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock [Member]
Common Stock [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-09 [Member] $ 67   $ 184   $ (117)  
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2018-02 [Member] 0       4,082 $ (4,082)
Balance, value at Dec. 31, 2016 1,251,012 $ 2,217 $ 995,837   271,957 (18,999)
Balance (in shares) at Dec. 31, 2016   9,000 58,042,000      
Net income 112,828       112,828  
Other comprehensive income 856         856
Issuance of common stock - acquisition related, shares   0 14,642,000      
Issuance of common stock - acquisition related, value 636,385 $ 0 $ 636,385      
Issuance of common stock - stock option and other plans, shares     49,000      
Issuance of common stock - stock option and other plans, value 1,980   $ 1,980      
Issuance of common stock - restricted stock awards, net of canceled awards, shares     241,000      
Issuance of common stock - restricted stock awards, net of canceled awards, value 7,745   $ 7,745      
Preferred stock conversion to common stock, shares   (9,000)        
Preferred stock conversion to common stock, value   $ (2,217)        
Preferred stock conversion to common stock, shares Issued     102,000      
Preferred stock conversion to common stock, value Issued 0   $ 2,217      
Activity in deferred compensation 1          
Purchase and retirement of common stock, shares     (56,000)      
Purchase and retirement of common stock, value (2,299)   $ (2,299)      
Cash settlement of acquired equity awards, value (7,345)   (7,345)      
Cash dividends declared on common stock (51,308)       (51,308)  
Balance, value at Dec. 31, 2017 $ 1,949,922 $ 0 $ 1,634,705   337,442 (22,225)
Balance (in shares) at Dec. 31, 2017   0 73,020,000      
Common Stock, Dividends, Per Share, paid $ 0.88          
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2018-02 [Member]           (4,082)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member] $ 0       (157) 157
Net income 172,882       172,882  
Other comprehensive income (13,237)         (13,237)
Issuance of common stock - stock option and other plans, shares     46,000      
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     246,000      
Issuance of common stock - restricted stock awards, net of canceled awards, value 8,354   $ 8,354      
Activity in deferred compensation 7   $ 7      
Purchase and retirement of common stock, shares     (63,000)      
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 $ 0 $ 1,642,246   426,708 (35,305)
Balance (in shares) at Dec. 31, 2018   0 73,249,000      
Common Stock, Dividends, Per Share, paid $ 1.14          
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-02 [Member] $ 782       782 0
Net income 194,451       194,451  
Other comprehensive income $ 75,672         75,672
Issuance of common stock - stock option and other plans, shares 4,327   59,000      
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     343,000      
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     (74,000)      
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 1,500,000   1,453,000      
Purchase of treasury stock, value $ (50,834)     $ (50,834)    
Balance, value at Dec. 31, 2019 $ 2,159,962 $ 0 $ 1,650,753 $ (50,834) $ 519,676 $ 40,367
Balance (in shares) at Dec. 31, 2019   0 72,124,000      
Common Stock, Dividends, Per Share, paid $ 1.40