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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
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cumulative effect upon adoption of ASC 606 $ 14,402     $ 14,402  
Beginning balance at Dec. 31, 2017 1,476,839 $ 1,571 $ 1,027,709 467,467 $ (19,908)
Beginning balance, shares at Dec. 31, 2017   157,069      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 261,515     261,515  
Other comprehensive income (loss) (8,313)       (8,313)
Purchase and retirement of common stock (186,898) $ (27) (13,390) (173,481)  
Purchase and retirement of common stock, shares   (2,751)      
Issuance of common stock under employee stock purchase plan 2,151   2,151    
Issuance of common stock under the employee stock purchase plan, shares   36      
Issuance of common stock upon exercise of stock options 67,807 $ 24 67,783    
Issuance of common stock upon exercise of stock options, shares   2,446      
Stock-based compensation 10,518   10,518    
Dividends declared (47,139)     (47,139)  
Ending balance at Jun. 30, 2018 1,590,882 $ 1,568 1,094,771 522,764 (28,221)
Ending balance, shares at Jun. 30, 2018   156,800      
Beginning balance at Mar. 31, 2018 1,613,654 $ 1,580 1,085,312 544,923 (18,161)
Beginning balance, shares at Mar. 31, 2018   157,990      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 121,677     121,677  
Other comprehensive income (loss) (10,060)       (10,060)
Purchase and retirement of common stock (104,642) $ (16) (7,929) (96,697)  
Purchase and retirement of common stock, shares   (1,629)      
Issuance of common stock under employee stock purchase plan 1,146   1,146    
Issuance of common stock under the employee stock purchase plan, shares   20      
Issuance of common stock upon exercise of stock options 10,923 $ 4 10,919    
Issuance of common stock upon exercise of stock options, shares   419      
Stock-based compensation 5,323   5,323    
Dividends declared (47,139)     (47,139)  
Ending balance at Jun. 30, 2018 1,590,882 $ 1,568 1,094,771 522,764 (28,221)
Ending balance, shares at Jun. 30, 2018   156,800      
Beginning balance at Dec. 31, 2018 $ 1,593,147 $ 1,536 1,106,641 517,970 (33,000)
Beginning balance, shares at Dec. 31, 2018 153,634 153,634      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 240,521     240,521  
Other comprehensive income (loss) 2,260       2,260
Purchase and retirement of common stock (185,817) $ (35) (18,939) (166,843)  
Purchase and retirement of common stock, shares   (3,550)      
Issuance of common stock under employee stock purchase plan 2,393   2,393    
Issuance of common stock under the employee stock purchase plan, shares   56      
Issuance of common stock upon exercise of stock options 21,879 $ 8 21,871    
Issuance of common stock upon exercise of stock options, shares   815      
Stock-based compensation 10,102   10,102    
Dividends declared (49,984)     (49,984)  
Ending balance at Jun. 30, 2019 $ 1,634,501 $ 1,509 1,122,068 541,664 (30,740)
Ending balance, shares at Jun. 30, 2019 150,955 150,955      
Beginning balance at Mar. 31, 2019 $ 1,636,550 $ 1,523 1,111,366 552,381 (28,720)
Beginning balance, shares at Mar. 31, 2019   152,276      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 126,540     126,540  
Other comprehensive income (loss) (2,020)       (2,020)
Purchase and retirement of common stock (97,028) $ (18) (9,737) (87,273)  
Purchase and retirement of common stock, shares   (1,825)      
Issuance of common stock under employee stock purchase plan 1,071   1,071    
Issuance of common stock under the employee stock purchase plan, shares   24      
Issuance of common stock upon exercise of stock options 14,308 $ 4 14,304    
Issuance of common stock upon exercise of stock options, shares   480      
Stock-based compensation 5,064   5,064    
Dividends declared (49,984)     (49,984)  
Ending balance at Jun. 30, 2019 $ 1,634,501 $ 1,509 $ 1,122,068 $ 541,664 $ (30,740)
Ending balance, shares at Jun. 30, 2019 150,955 150,955