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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, 2016   $ 1,590 $ 955,461 $ 384,018 $ (37,955)
Beginning balance, shares at Dec. 31, 2016   159,031      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock   $ (44) (20,243) (227,827)  
Purchase and retirement of common stock, shares   (4,403)      
Issuance of common stock under the employee stock purchase plan   $ 1 3,280    
Issuance of common stock under the employee stock purchase plan, shares   71      
Issuance of common stock upon exercise of stock options   $ 24 50,263    
Issuance of common stock upon exercise of stock options, shares 2,370 2,370      
Stock-based compensation     36,366    
Net income $ 404,389     404,389  
Dividends declared ($0.68, $0.63 and $0.58 per share) (91,444)     (91,444)  
Other comprehensive income (loss) 18,047       18,047
Ending balance at Dec. 31, 2017 $ 1,476,839 $ 1,571 1,027,709 467,467 (19,908)
Ending 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 ($0.68, $0.63 and $0.58 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 153,634 153,634      
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 ($0.68, $0.63 and $0.58 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