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Consolidated Statement of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity          
Adjustment as a result of the adoption of ASU 2016-06 Income Taxes - Intra-Entity Transfers Other than Inventory (Note 12) $ (5,961)     $ (5,961)  
Beginning Balance (in shares) at Dec. 31, 2017 173,507 173,507      
Beginning Balance at Dec. 31, 2017 $ 1,095,673 $ 347 $ 461,338 668,587 $ (34,599)
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock under stock plans (in shares)   1,434      
Issuance of common stock under stock plans 25,882 $ 3 25,879    
Repurchase of common stock (in shares)   (2,750)      
Repurchase of common stock (142,262) $ (5)   (142,257)  
Stock-based compensation expense 31,339   31,339    
Payment of dividends (23,283)     (23,283)  
Net income 173,849     173,849  
Net unrealized gain (loss) on available-for-sale investments, net of tax of ($82) (180)       (180)
Reclassification of net realized (gain) loss on the sale of available-for-sale investments (535)       (535)
Foreign currency translation adjustment $ (5,078)       (5,078)
Ending Balance (in shares) at Sep. 30, 2018 172,032 172,191      
Ending Balance at Sep. 30, 2018 $ 1,149,444 $ 345 $ 518,556 $ 670,935 $ (40,392)