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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
Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2018   $ 1,536 $ 1,106,641 $ 517,970 $ (33,000)
Beginning 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 ($0.77, $0.72 and $0.68 per share) (102,435)     (102,435)  
Other comprehensive (loss) income 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      
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 ($0.77, $0.72 and $0.68 per share) (104,588)     (104,588)  
Other comprehensive (loss) income 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      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock   $ (67) (40,058) (371,409)  
Purchase and retirement of common stock, shares   (6,747)      
Issuance of common stock under the employee stock purchase plan   $ 0 4,115    
Issuance of common stock under the employee stock purchase plan, shares   81      
Issuance of common stock upon exercise of stock options   $ 17 51,099    
Issuance of common stock upon exercise of stock options, shares 1,719 1,719      
Stock-based compensation     41,451    
Net income $ 546,593     546,593  
Dividends declared ($0.77, $0.72 and $0.68 per share) (107,840)     (107,840)  
Other comprehensive (loss) income (3,045)       (3,045)
Ending balance at Dec. 31, 2021 $ 1,860,763 $ 1,384 $ 1,246,608 $ 632,614 $ (19,843)
Ending balance, shares at Dec. 31, 2021 138,449 138,449