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Consolidated Statements Of Changes In Stockholders' Equity - USD ($)
Total
Common Stock
Additional paid-in capital
Retained Earnings
Treasury stock
Accumulated Other Comprehensive Income (loss), net
Balance, shares at Dec. 31, 2018   126,639,912        
Balance at beginning of period at Dec. 31, 2018 $ 1,903,211,000 $ 136,000 $ 1,423,405,000 $ 662,375,000 $ (150,000,000) $ (32,705,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Accounting Standards Update [Extensible List] Accounting Standards Update 2016-01 [Member]          
Issuance of additional shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)   59,725        
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations $ 12,000 $ 0 12,000      
Stock-based compensation 4,649,000   4,649,000      
Cash dividends declared on common stock (70,935,000)     (70,935,000)    
Comprehensive income:            
Net income 171,040,000     171,040,000    
Other comprehensive (loss) income, net of tax $ 41,854,000         41,854,000
Repurchase of treasury stock, shares (943,094) (943,094)        
Repurchase of treasury stock $ (13,820,000)       (13,820,000)  
Balance, shares at Dec. 31, 2019   125,756,543        
Balance at end of period at Dec. 31, 2019 $ 2,036,011,000 $ 136,000 1,428,066,000 762,480,000 (163,820,000) 9,149,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Accounting Standards Update [Extensible List] Accounting Standards Update 2016-13 [Member]          
CECL day 1 impact tax adjustment       7,856,000    
Issuance of additional shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)   224,355        
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations $ 0 $ 0 0      
Stock-based compensation 6,850,000   6,850,000      
Cash dividends declared on common stock (69,182,000)     (69,182,000)    
Comprehensive income:            
Net income 111,515,000     111,515,000    
Other comprehensive (loss) income, net of tax $ 23,604,000         23,604,000
Repurchase of treasury stock, shares (2,716,034) (2,716,034)        
Repurchase of treasury stock $ (36,180,000)       (36,180,000)  
Balance, shares at Dec. 31, 2020 123,264,864 123,264,864        
Balance at end of period at Dec. 31, 2020 $ 2,053,745,000 $ 136,000 1,434,916,000 785,940,000 (200,000,000) 32,753,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Accounting Standards Update [Extensible List] Accounting Standards Update 2020-06          
Issuance of additional shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)   423,856        
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations $ 0 $ 0 0      
Stock-based compensation 5,042,000   5,042,000      
Cash dividends declared on common stock (68,666,000)     (68,666,000)    
Comprehensive income:            
Net income 204,572,000     204,572,000    
Other comprehensive (loss) income, net of tax (44,165,000)         (44,165,000)
Repurchase of treasury stock, shares   (3,682,268)        
Repurchase of treasury stock $ (50,000,000)       (50,000,000)  
Balance, shares at Dec. 31, 2021 120,006,452 120,006,452        
Balance at end of period at Dec. 31, 2021 $ 2,092,983,000 $ 136,000 1,421,698,000 932,561,000 $ (250,000,000) $ (11,412,000)
Comprehensive income:            
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt     (21,420,000)      
AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt, tax     $ 3,160,000      
Convertible Debt, Cumulative Effect on Retained Earnings Before Tax       $ 10,715,000    
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature (10,705,000)          
AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature, tax $ 3,160,000