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Consolidated Statements Of Changes In Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Capital In Excess Of Par Value [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Beginning balance at Dec. 31, 2013   $ 1,692 $ 721,219 $ 431,604 $ 1,487
Beginning balance, shares at Dec. 31, 2013   169,242      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock   $ (79) (25,345) (252,933)  
Purchase and retirement of common stock, shares   (7,888)      
Issuance of common stock under the employee stock purchase plan   $ 1 2,197    
Issuance of common stock under the employee stock purchase plan, shares   73      
Issuance of common stock upon exercise of stock options   $ 53 102,646    
Issuance of common stock upon exercise of stock options, shares 5,261 5,261      
Stock-based compensation $ (13,463)   13,463    
Tax benefit on stock options exercised     20,435    
Net income 318,713     318,713  
Dividends declared ($0.54, $0.50 and $0.46 per share) (77,158)     (77,158)  
Other comprehensive loss (10,382)       (10,382)
Total Equity at Dec. 31, 2014 $ 1,247,613 $ 1,667 834,615 420,226 (8,895)
Ending balance, shares at Dec. 31, 2014   166,688      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchase and retirement of common stock   $ (60) (22,984) (266,543)  
Purchase and retirement of common stock, shares   (5,951)      
Issuance of common stock under the employee stock purchase plan   $ 1 2,798    
Issuance of common stock under the employee stock purchase plan, shares   69      
Issuance of common stock upon exercise of stock options   $ 29 62,716    
Issuance of common stock upon exercise of stock options, shares 2,927 2,927      
Stock-based compensation $ (17,312)   17,312    
Tax benefit on stock options exercised     16,056    
Net income 331,655     331,655  
Dividends declared ($0.54, $0.50 and $0.46 per share) (82,478)     (82,478)  
Other comprehensive loss (16,395)       (16,395)
Total Equity at Dec. 31, 2015 $ 1,289,720 $ 1,637 910,513 402,860 (25,290)
Ending balance, shares at Dec. 31, 2015 163,733 163,733      
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 ($0.54, $0.50 and $0.46 per share) (86,657)     (86,657)  
Other comprehensive loss (12,665)       (12,665)
Total Equity at Dec. 31, 2016 $ 1,303,114 $ 1,590 $ 955,461 $ 384,018 $ (37,955)
Ending balance, shares at Dec. 31, 2016 159,031 159,031