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Consolidated Statements Of Changes In Stockholders' Equity - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
Retained earnings
Treasury stock
Accumulated other comprehensive (loss) income, net
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01 $ (188)     $ (469)   $ 281
Balance at Dec. 31, 2017 1,928,255 $ 136 $ 1,405,014 544,886 $ 0 (21,781)
Balance, shares at Dec. 31, 2017   135,511,891        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations 209   209      
Issuance of shares pursuant to various stock plans, shares   17,554        
Stock-based compensation 1,411   1,411      
Cash dividends declared on common stock ($0.26 per share) (35,235)     (35,235)    
Comprehensive income:            
Net income 98,762     98,762    
Other comprehensive income (loss) (23,622)         (23,622)
Repurchase of treasury stock, shares   (4,361,740)        
Repurchase of treasury stock (78,961)       (78,961)  
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt     15,045      
Equity component of convertible notes, net of taxes 15,045          
Balance at Jun. 30, 2018 1,905,676 $ 136 1,421,679 607,944 (78,961) (45,122)
Balance, shares at Jun. 30, 2018   131,167,705        
Balance at Dec. 31, 2017 $ 1,928,255 $ 136 1,405,014 544,886 0 (21,781)
Balance, shares at Dec. 31, 2017   135,511,891        
Comprehensive income:            
Repurchase of treasury stock, shares (9,002,453)          
Balance at Dec. 31, 2018 $ 1,903,211 $ 136 1,423,405 662,375 (150,000) (32,705)
Balance, shares at Dec. 31, 2018   126,639,912        
Balance at Mar. 31, 2018 1,945,333 $ 136 1,405,806 578,031 0 (38,640)
Balance, shares at Mar. 31, 2018   135,516,119        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations 97   97      
Issuance of shares pursuant to various stock plans, shares   13,326        
Stock-based compensation 731   731      
Cash dividends declared on common stock ($0.26 per share) (17,617)     (17,617)    
Comprehensive income:            
Net income 47,530     47,530    
Other comprehensive income (loss) (6,482)         (6,482)
Repurchase of treasury stock, shares   (4,361,740)        
Repurchase of treasury stock (78,961)       (78,961)  
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt     15,045      
Equity component of convertible notes, net of taxes 15,045          
Balance at Jun. 30, 2018 1,905,676 $ 136 1,421,679 607,944 (78,961) (45,122)
Balance, shares at Jun. 30, 2018   131,167,705        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Reclassification of unrealized losses on equity investments to retained earnings - ASU 2016-01       (469)   281
Balance at Dec. 31, 2018 1,903,211 $ 136 1,423,405 662,375 (150,000) (32,705)
Balance, shares at Dec. 31, 2018   126,639,912        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares pursuant to various stock plans, net of forfeitures and tax withholding cancellations 3   3      
Issuance of shares pursuant to various stock plans, shares   33,910        
Stock-based compensation 1,854   1,854      
Cash dividends declared on common stock ($0.26 per share) (35,463)     (35,463)    
Comprehensive income:            
Net income 85,439     85,439    
Other comprehensive income (loss) $ 40,128         40,128
Repurchase of treasury stock, shares 0          
Repurchase of treasury stock $ (100,000)          
Balance at Jun. 30, 2019 1,995,172 $ 136 1,425,262 712,351 (150,000) 7,423
Balance, shares at Jun. 30, 2019   126,673,822        
Balance at Mar. 31, 2019 1,946,211 $ 136 1,424,029 687,404 (150,000) (15,358)
Balance, shares at Mar. 31, 2019   126,635,584        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of shares pursuant to various stock plans, shares   38,238        
Stock-based compensation 1,233   1,233      
Cash dividends declared on common stock ($0.26 per share) (17,734)     (17,734)    
Comprehensive income:            
Net income 42,681     42,681    
Other comprehensive income (loss) 22,781         22,781
Balance at Jun. 30, 2019 $ 1,995,172 $ 136 $ 1,425,262 $ 712,351 $ (150,000) $ 7,423
Balance, shares at Jun. 30, 2019   126,673,822