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Consolidated Statement of Shareholders' Equity (USD $)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2010 $ 473,311,000 $ 164,000 $ 102,538,000 $ 379,826,000 $ (9,217,000)
Beginning Balance, Shares at Dec. 31, 2010   82,130,000      
Issuance of common stock under stock option plans 30,863,000 6,000 30,857,000    
Issuance of common stock under stock option plans, shares   2,990,000      
Stock-based compensation expense 8,068,000   8,068,000    
Excess tax benefit from stock option exercises 4,045,000   4,045,000    
Tax benefit for research and development credits as a result of stock option accounting 74,000   74,000    
Repurchase of common stock (10,000,000) (2,000) (9,998,000)    
Repurchase of common stock, shares   (674,000)      
Payment of dividends (15,114,000)     (15,114,000)  
Net income 69,869,000     69,869,000  
Net unrealized gain (loss) on available-for-sale investments, net of tax 174,000       174,000
Reclassification of net realized (gain) loss on the sale of available-for-sale investments 181,000       181,000
Foreign currency translation adjustment, net of tax (8,491,000)       (8,491,000)
Ending Balance at Dec. 31, 2011 552,980,000 168,000 135,584,000 434,581,000 (17,353,000)
Ending Balance, Shares at Dec. 31, 2011   84,446,000      
Issuance of common stock under stock option plans 17,468,000 4,000 17,464,000    
Issuance of common stock under stock option plans, shares   1,664,000      
Stock-based compensation expense 8,520,000   8,520,000    
Excess tax benefit from stock option exercises 3,594,000   3,594,000    
Payment of dividends (66,213,000)     (66,213,000)  
Net income 68,098,000     68,098,000  
Net unrealized gain on derivative instruments, net of tax 0        
Net unrealized gain (loss) on available-for-sale investments, net of tax 2,079,000       2,079,000
Reclassification of net realized (gain) loss on the sale of available-for-sale investments (1,695,000)       (1,695,000)
Foreign currency translation adjustment, net of tax (12,546,000)       (12,546,000)
Ending Balance at Dec. 31, 2012 572,285,000 [1] 172,000 165,162,000 436,466,000 (29,515,000)
Ending Balance, Shares at Dec. 31, 2012 86,110,000 [1] 86,110,000      
Issuance of common stock under stock option plans 27,792,000 2,000 27,790,000    
Issuance of common stock under stock option plans, shares 2,445,000 2,440,000      
Stock-based compensation expense 10,620,000   10,620,000    
Excess tax benefit from stock option exercises 7,658,000   7,658,000    
Tax benefit for research and development credits as a result of stock option accounting 210,000   210,000    
Repurchase of common stock (47,908,000)     (47,908,000)  
Repurchase of common stock, shares   (1,719,000)      
Net income 73,573,000     73,573,000  
Net unrealized gain on derivative instruments, net of tax 104,000       104,000
Net unrealized gain (loss) on available-for-sale investments, net of tax (190,000)       (190,000)
Reclassification of net realized (gain) loss on the sale of available-for-sale investments (314,000)       (314,000)
Foreign currency translation adjustment, net of tax 82,000       82,000
Ending Balance at Dec. 31, 2013 $ 643,912,000 [1] $ 174,000 $ 211,440,000 $ 462,131,000 $ (29,833,000)
Ending Balance, Shares at Dec. 31, 2013 86,831,000 [1] 86,831,000      
[1] Prior period amounts have been adjusted to reflect the two-for-one stock split effected in the form of a stock dividend which occurred in the third quarter of 2013.