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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Capital Surplus [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net [Member]
Balance at Dec. 31, 2017 $ 2,884,949   $ 292,716 $ 1,718,117 $ 1,008,518   $ (134,402)
Balance, Shares Issued at Dec. 31, 2017     87,903        
Net income (loss) 323,770       323,770    
Other comprehensive income (loss) (46,307)           (46,307)
Comprehensive income 277,463       323,770   (46,307)
Cash dividends declared (88,838)       (88,838)    
Common stock activity, long-term incentive plans 12,624     12,482 142    
Issuance of stock from dividend reinvestment and stock purchase plans 3,409     3,409      
Purchase of common stock (200,000 shares) (8,267)     (8,267)      
Balance at Dec. 31, 2018 3,081,340   $ 292,716 1,725,741 1,243,592   (180,709)
Balance, Shares Issued at Dec. 31, 2018     87,903        
Net income (loss) 327,380       327,380    
Other comprehensive income (loss) 125,985           125,985
Comprehensive income 453,365       327,380   125,985
Cash dividends declared (94,871)       (94,871)    
Common stock activity, long-term incentive plans 15,388     15,257 131    
Common stock issued as consideration in business combination 193,849   $ 16,797 177,052      
Common stock issued as consideration in business combination, Shares Issued     5,044        
Issuance of stock from dividend reinvestment and stock purchase plans 3,614     3,614      
Initial delivery of shares under accelerated share repurchase agreement (138,768)     (138,768)      
Forward contract for accelerated share repurchase agreement (46,232)     (46,232)      
Balance at Dec. 31, 2019 $ 3,467,685 $ (44,087) $ 309,513 1,736,664 1,476,232 $ (44,087) (54,724)
Balance, Shares Issued at Dec. 31, 2019 92,947   92,947        
Net income (loss) $ (45,174)       (45,174)    
Other comprehensive income (loss) 134,793           134,793
Comprehensive income 89,619       (45,174)   134,793
Cash dividends declared (95,605)       (95,605)    
Common stock activity, long-term incentive plans 17,855     17,715 140    
Issuance of stock from dividend reinvestment and stock purchase plans 4,164     4,164      
Net settlement of accelerated share repurchase agreement (1,001,472 shares) 12,110     12,110      
Initial delivery of shares under accelerated share repurchase agreement (12,716)     (12,716)      
Balance at Dec. 31, 2020 $ 3,439,025   $ 309,513 $ 1,757,937 $ 1,291,506   $ 80,069
Balance, Shares Issued at Dec. 31, 2020 92,947   92,947