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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 (in shares) at Dec. 31, 2019   149,745      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock (in shares)   (8,007)      
Issuance of common stock under the employee stock purchase plan (in shares)   95      
Issuance of common stock upon exercise of stock options (in shares) 1,563 1,563      
Ending balance (in shares) at Dec. 31, 2020   143,396      
Beginning balance at Dec. 31, 2019   $ 1,497 $ 1,158,900 $ 601,885 $ (23,504)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock   (80) (45,309) (379,313)  
Issuance of common stock under the employee stock purchase plan   1 4,346    
Issuance of common stock upon exercise of stock options   16 45,050    
Stock-based compensation     27,014    
Net income $ 447,286     447,286  
Dividends declared ($0.83, $0.77 and $0.72 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock (in shares)   (6,747)      
Issuance of common stock under the employee stock purchase plan (in shares)   81      
Issuance of common stock upon exercise of stock options (in shares) 1,719 1,719      
Ending balance (in shares) at Dec. 31, 2021 138,449 138,449      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock   $ (67) (40,058) (371,409)  
Issuance of common stock under the employee stock purchase plan   0 4,115    
Issuance of common stock upon exercise of stock options   17 51,099    
Stock-based compensation     41,451    
Net income $ 546,593     546,593  
Dividends declared ($0.83, $0.77 and $0.72 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock (in shares)   (5,914)      
Issuance of common stock under the employee stock purchase plan (in shares)   90      
Issuance of common stock upon exercise of stock options (in shares) 1,537 1,537      
Ending balance (in shares) at Dec. 31, 2022 134,162 134,162      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock   $ (58) (37,019) (301,365)  
Issuance of common stock under the employee stock purchase plan   1 4,340    
Issuance of common stock upon exercise of stock options   15 53,830    
Stock-based compensation     39,403    
Net income $ 475,467     475,467  
Dividends declared ($0.83, $0.77 and $0.72 per share) (112,429)     (112,429)  
Other comprehensive (loss) income (29,124)       (29,124)
Ending balance at Dec. 31, 2022 $ 1,953,824 $ 1,342 $ 1,307,162 $ 694,287 $ (48,967)