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CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2012 $ 572,285 $ 172 $ 165,162 $ 436,466 $ (29,515)
Beginning Balance, Shares at Dec. 31, 2012   86,110      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock under stock option plans 27,792 $ 2 27,790    
Issuance of common stock under stock option plans, shares   2,440      
Repurchase of common stock (47,908)     (47,908)  
Repurchase of common stock, shares   (1,719)      
Stock-based compensation expense 10,620   10,620    
Excess tax benefit from stock option exercises 7,658   7,658    
Tax benefit for research and development credits as a result of stock options 210   210    
Net income 73,573     73,573  
Net unrealized gain (loss) on cash flow hedges, net of tax 104       104
Reclassification of net realized (gain) loss into current operations 0        
Net unrealized gain (loss) on available-for-sale investments, net of tax (190)       (190)
Reclassification of net realized gain on the sale of available-for-sale investments (314)       (314)
Foreign currency translation adjustments, net of tax 82       82
Balance at Dec. 31, 2013 643,912 $ 174 211,440 462,131 (29,833)
Balance, Shares at Dec. 31, 2013   86,831      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock under stock option plans 16,930 $ 2 16,928    
Issuance of common stock under stock option plans, shares   1,245      
Repurchase of common stock (59,673) $ (3)   (59,670)  
Repurchase of common stock, shares   (1,534)      
Stock-based compensation expense 15,158   15,158    
Excess tax benefit from stock option exercises 7,871   7,871    
Tax benefit for research and development credits as a result of stock options 320   320    
Net income 121,485     121,485  
Net unrealized gain (loss) on cash flow hedges, net of tax (118)       (118)
Reclassification of net realized (gain) loss into current operations 46       46
Net unrealized gain (loss) on available-for-sale investments, net of tax 579       579
Reclassification of net realized gain on the sale of available-for-sale investments (673)       (673)
Foreign currency translation adjustments, net of tax (9,400)       (9,400)
Balance at Dec. 31, 2014 $ 736,437 $ 173 251,717 523,946 (39,399)
Balance, Shares at Dec. 31, 2014 86,542 86,542      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock under stock option plans $ 27,582 $ 3 27,579    
Issuance of common stock under stock option plans, shares 1,520 1,520      
Repurchase of common stock $ (126,351) $ (6)   (126,345)  
Repurchase of common stock, shares   (3,206)      
Stock-based compensation expense 21,274   21,274    
Excess tax benefit from stock option exercises 9,964   9,964    
Tax benefit for research and development credits as a result of stock options 474   474    
Payment of dividends (18,062)     (18,062)  
Net income 187,074     187,074  
Net unrealized gain (loss) on cash flow hedges, net of tax (27)       (27)
Reclassification of net realized (gain) loss into current operations 201       201
Net unrealized gain (loss) on available-for-sale investments, net of tax (939)       (939)
Reclassification of net realized gain on the sale of available-for-sale investments (344)       (344)
Foreign currency translation adjustments, net of tax (11,616)       (11,616)
Balance at Dec. 31, 2015 $ 825,667 $ 170 $ 311,008 $ 566,613 $ (52,124)
Balance, Shares at Dec. 31, 2015 84,856 84,856