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Consolidated Statements Of Changes In Stockholders' Equity (Unaudited) - USD ($)
Total
Common stock
Additional paid-in capital
Retained earnings
Treasury stock
Accumulated other comprehensive income, net
Balance at beginning of period (in shares) at Dec. 31, 2019   125,756,543        
Balance at beginning 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]            
Adoption of ASU 2020-06 (26,729,000)     (26,729,000)    
Adoption of ASU 2020-06 tax impact $ 7,947,000     (7,947,000)    
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member          
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)   198,767        
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations $ 0   0      
Stock-based compensation 2,691,000   2,691,000      
Cash dividends declared on common stock (34,670,000)     (34,670,000)    
Comprehensive income:            
Net income 52,706,000     52,706,000    
Other comprehensive income (loss) 29,000,000         29,000,000
Repurchase of treasury stock, (in shares)   (2,716,034)        
Repurchase of treasury stock (36,180,000)       (36,180,000)  
Balance at end of period (in shares) at Jun. 30, 2020   123,239,276        
Balance at end of period at Jun. 30, 2020 2,030,776,000 $ 136,000 1,430,757,000 761,734,000 (200,000,000) 38,149,000
Balance at beginning of period (in shares) at Mar. 31, 2020   123,169,404        
Balance at beginning of period at Mar. 31, 2020 2,018,088,000 $ 136,000 1,429,275,000 752,228,000 (200,000,000) 36,449,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)   69,872        
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations 0   0      
Stock-based compensation 1,482,000   1,482,000      
Cash dividends declared on common stock (17,247,000)     (17,247,000)    
Comprehensive income:            
Net income 26,753,000     26,753,000    
Other comprehensive income (loss) 1,700,000         1,700,000
Balance at end of period (in shares) at Jun. 30, 2020   123,239,276        
Balance at end of period at Jun. 30, 2020 2,030,776,000 $ 136,000 1,430,757,000 761,734,000 (200,000,000) 38,149,000
Balance at beginning of period (in shares) at Dec. 31, 2020   123,264,864        
Balance at beginning 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
Balance at end of period (in shares) at Mar. 31, 2021   123,480,494        
Balance at end of period at Mar. 31, 2021 2,045,581,000 $ 136,000 1,417,137,000 823,085,000 (200,000,000) 5,223,000
Balance at beginning of period (in shares) at Dec. 31, 2020   123,264,864        
Balance at beginning 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]            
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)   408,968        
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations 0   0      
Stock-based compensation 1,485,000   1,485,000      
Cash dividends declared on common stock (34,557,000)     (34,557,000)    
Comprehensive income:            
Net income 97,450,000     97,450,000    
Other comprehensive income (loss) (17,702,000)         (17,702,000)
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature (10,705,000)          
AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature, tax 3,154,000          
Balance at end of period (in shares) at Jun. 30, 2021   123,673,832        
Balance at end of period at Jun. 30, 2021 2,092,870,000 $ 136,000 1,418,135,000 859,548,000 (200,000,000) 15,051,000
Comprehensive income:            
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt     (21,420,000)      
AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt, tax     3,154,000      
Balance at beginning of period (in shares) at Mar. 31, 2021   123,480,494        
Balance at beginning of period at Mar. 31, 2021 2,045,581,000 $ 136,000 1,417,137,000 823,085,000 (200,000,000) 5,223,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations (in shares)   193,338        
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations 0   0      
Stock-based compensation 990,000   990,000      
Cash dividends declared on common stock (17,300,000)     (17,300,000)    
Comprehensive income:            
Net income 53,763,000     53,763,000    
Other comprehensive income (loss) $ 9,828,000         9,828,000
Repurchase of treasury stock, (in shares) 0          
AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeature, tax $ 8,000          
Balance at end of period (in shares) at Jun. 30, 2021   123,673,832        
Balance at end of period at Jun. 30, 2021 $ 2,092,870,000 $ 136,000 1,418,135,000 859,548,000 $ (200,000,000) $ 15,051,000
Comprehensive income:            
Convertible debt, cumulative effect on retained earnings before tax       $ 10,715,000    
AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt, tax     $ 8,000