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Consolidated Statements of Changes in Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Capital In Excess of Par Value
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2017   $ 1,571 $ 1,027,709 $ 467,467 $ 14,402 $ (19,908)
Beginning balance, shares at Dec. 31, 2017   157,069        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Purchase and retirement of common stock   $ (67) (32,823) (371,867)    
Purchase and retirement of common stock, shares   (6,744)        
Issuance of common stock under the employee stock purchase plan     4,170      
Issuance of common stock under the employee stock purchase plan, shares   77        
Issuance of common stock upon exercise of stock options   $ 32 83,780      
Issuance of common stock upon exercise of stock options, shares 3,232 3,232        
Stock-based compensation     23,805      
Net income $ 505,868     505,868    
Dividends declared ($0.72, $0.68 and $0.63 per share) (97,900)     (97,900)    
Other comprehensive income (loss) (13,092)         (13,092)
Ending balance at Dec. 31, 2018 $ 1,593,147 $ 1,536 1,106,641 517,970   (33,000)
Ending balance, shares at Dec. 31, 2018   153,634        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Purchase and retirement of common stock   $ (62) (33,210) (315,076)    
Purchase and retirement of common stock, shares   (6,225)        
Issuance of common stock under the employee stock purchase plan   $ 1 4,224      
Issuance of common stock under the employee stock purchase plan, shares   93        
Issuance of common stock upon exercise of stock options   $ 22 56,663      
Issuance of common stock upon exercise of stock options, shares 2,243 2,243        
Stock-based compensation     24,582      
Net income $ 501,426     501,426    
Dividends declared ($0.72, $0.68 and $0.63 per share) (102,435)     (102,435)    
Other comprehensive income (loss) 9,496         9,496
Ending balance at Dec. 31, 2019 $ 1,738,778 $ 1,497 1,158,900 601,885   (23,504)
Ending balance, shares at Dec. 31, 2019 149,745 149,745        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Purchase and retirement of common stock   $ (80) (45,309) (379,313)    
Purchase and retirement of common stock, shares   (8,007)        
Issuance of common stock under the employee stock purchase plan   $ 1 4,346      
Issuance of common stock under the employee stock purchase plan, shares   95        
Issuance of common stock upon exercise of stock options   $ 16 45,050      
Issuance of common stock upon exercise of stock options, shares 1,563 1,563        
Stock-based compensation     27,014      
Net income $ 447,286     447,286    
Dividends declared ($0.72, $0.68 and $0.63 per share) (104,588)     (104,588)    
Other comprehensive income (loss) 6,706         6,706
Ending balance at Dec. 31, 2020 $ 1,739,907 $ 1,434 $ 1,190,001 $ 565,270   $ (16,798)
Ending balance, shares at Dec. 31, 2020 143,396 143,396