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Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Capital In Excess of Par Value
Retained Earnings
Accumulated Other Comprehensive Loss
Beginning balance, shares at Dec. 31, 2017   157,069      
Beginning balance at Dec. 31, 2017 $ 1,476,839 $ 1,571 $ 1,027,709 $ 467,467 $ (19,908)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 389,834     389,834  
Other comprehensive loss (8,955)       (8,955)
Purchase and retirement of common stock (289,534) $ (44) (21,507) (267,983)  
Purchase and retirement of common stock, shares   (4,419)      
Issuance of common stock under employee stock purchase plan 3,258 $ 1 3,257    
Issuance of common stock under the employee stock purchase plan, shares   57      
Issuance of common stock upon exercise of stock options 75,409 $ 27 75,382    
Issuance of common stock upon exercise of stock options, shares   2,768      
Stock-based compensation 16,396   16,396    
Dividends declared (47,139)     (47,139)  
Ending balance at Sep. 30, 2018 1,630,510 $ 1,555 1,101,237 556,581 (28,863)
Ending balance, shares at Sep. 30, 2018   155,475      
Beginning balance, shares at Jun. 30, 2018   156,800      
Beginning balance at Jun. 30, 2018 1,590,882 $ 1,568 1,094,771 522,764 (28,221)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 128,319     128,319  
Other comprehensive loss (642)       (642)
Purchase and retirement of common stock (102,636) $ (17) (8,117) (94,502)  
Purchase and retirement of common stock, shares   (1,668)      
Issuance of common stock under employee stock purchase plan 1,107 $ 1 1,106    
Issuance of common stock under the employee stock purchase plan, shares   21      
Issuance of common stock upon exercise of stock options 7,602 $ 3 7,599    
Issuance of common stock upon exercise of stock options, shares   322      
Stock-based compensation 5,878   5,878    
Ending balance at Sep. 30, 2018 $ 1,630,510 $ 1,555 1,101,237 556,581 (28,863)
Ending balance, shares at Sep. 30, 2018   155,475      
Beginning balance, shares at Dec. 31, 2018 153,634 153,634      
Beginning balance at Dec. 31, 2018 $ 1,593,147 $ 1,536 1,106,641 517,970 (33,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 372,689     372,689  
Other comprehensive loss (2,780)       (2,780)
Purchase and retirement of common stock (267,184) $ (50) (26,408) (240,726)  
Purchase and retirement of common stock, shares   (4,950)      
Issuance of common stock under employee stock purchase plan 3,392 $ 1 3,391    
Issuance of common stock under the employee stock purchase plan, shares   77      
Issuance of common stock upon exercise of stock options 38,472 $ 15 38,457    
Issuance of common stock upon exercise of stock options, shares   1,461      
Stock-based compensation 15,555   15,555    
Dividends declared (49,984)     (49,984)  
Ending balance at Sep. 30, 2019 $ 1,703,307 $ 1,502 1,137,636 599,949 (35,780)
Ending balance, shares at Sep. 30, 2019 150,222 150,222      
Beginning balance, shares at Jun. 30, 2019   150,955      
Beginning balance at Jun. 30, 2019 $ 1,634,501 $ 1,509 1,122,068 541,664 (30,740)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 132,168     132,168  
Other comprehensive loss (5,040)       (5,040)
Purchase and retirement of common stock (81,367) $ (15) (7,469) (73,883)  
Purchase and retirement of common stock, shares   (1,400)      
Issuance of common stock under employee stock purchase plan 999 $ 1 998    
Issuance of common stock under the employee stock purchase plan, shares   21      
Issuance of common stock upon exercise of stock options 16,593 $ 7 16,586    
Issuance of common stock upon exercise of stock options, shares   646      
Stock-based compensation 5,453   5,453    
Ending balance at Sep. 30, 2019 $ 1,703,307 $ 1,502 $ 1,137,636 $ 599,949 $ (35,780)
Ending balance, shares at Sep. 30, 2019 150,222 150,222