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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 139,838     139,838  
Other comprehensive gain 1,747       1,747
Purchase and retirement of common stock (82,256) $ (11) (5,461) (76,784)  
Purchase and retirement of common stock, shares   (1,122)      
Issuance of common stock under employee stock purchase plan 1,005 $ 0 1,005    
Issuance of common stock under the employee stock purchase plan, shares   16      
Issuance of common stock upon exercise of stock options 56,884 $ 20 56,864    
Issuance of common stock upon exercise of stock options, shares   2,027      
Stock-based compensation 5,195   5,195    
Ending balance at Mar. 31, 2018 1,613,654 $ 1,580 1,085,312 544,923 (18,161)
Ending balance, shares at Mar. 31, 2018   157,990      
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 $ 113,981     113,981  
Other comprehensive gain 4,280       4,280
Purchase and retirement of common stock (88,789) $ (17) (9,202) (79,570)  
Purchase and retirement of common stock, shares   (1,725)      
Issuance of common stock under employee stock purchase plan 1,322 $ 0 1,322    
Issuance of common stock under the employee stock purchase plan, shares   32      
Issuance of common stock upon exercise of stock options 7,571 $ 4 7,567    
Issuance of common stock upon exercise of stock options, shares   335      
Stock-based compensation 5,038   5,038    
Ending balance at Mar. 31, 2019 $ 1,636,550 $ 1,523 $ 1,111,366 $ 552,381 $ (28,720)
Ending balance, shares at Mar. 31, 2019 152,276 152,276