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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
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect upon adoption of ASUs     $ 0    
Cumulative effect upon adoption of ASUs | Accounting Standards Update 2014-09       $ 0  
Cumulative effect upon adoption of ASUs | Accounting Standards Update 2016-09       0  
Beginning balance at Dec. 31, 2015   $ 1,637 910,513 402,860 $ (25,290)
Beginning balance, shares at Dec. 31, 2015   163,733      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock   $ (66) (28,306) (266,002)  
Purchase and retirement of common stock, shares   (6,600)      
Issuance of common stock under the employee stock purchase plan   $ 1 3,357    
Issuance of common stock under the employee stock purchase plan, shares   88      
Issuance of common stock upon exercise of stock options   $ 18 44,896    
Issuance of common stock upon exercise of stock options, shares 1,809 1,810      
Stock-based compensation $ (16,017)   16,017    
Tax benefit on stock options exercised     8,984    
Net income 333,817     333,817  
Dividends declared ($0.63, $0.58 and $0.54 per share) (86,657)     (86,657)  
Other comprehensive (loss) gain (12,665)       (12,665)
Ending balance at Dec. 31, 2016 $ 1,303,114 $ 1,590 955,461 384,018 (37,955)
Ending balance, shares at Dec. 31, 2016   159,031      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect upon adoption of ASUs     2,582    
Cumulative effect upon adoption of ASUs | Accounting Standards Update 2014-09       0  
Cumulative effect upon adoption of ASUs | Accounting Standards Update 2016-09       (1,669)  
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)   36,366    
Tax benefit on stock options exercised     0    
Net income 404,389     404,389  
Dividends declared ($0.63, $0.58 and $0.54 per share) (91,444)     (91,444)  
Other comprehensive (loss) gain 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 157,069 157,069      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect upon adoption of ASUs     0    
Cumulative effect upon adoption of ASUs | Accounting Standards Update 2014-09       14,402  
Cumulative effect upon adoption of ASUs | Accounting Standards Update 2016-09       0  
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   $ 0 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)   23,805    
Tax benefit on stock options exercised     0    
Net income 505,868     505,868  
Dividends declared ($0.63, $0.58 and $0.54 per share) (97,900)     (97,900)  
Other comprehensive (loss) gain (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