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CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY (USD $)
In Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2009 $ 394,448 $ 79 $ 69,271 $ 328,459 $ (3,361)
Beginning Balance, Shares at Dec. 31, 2009   39,665      
Issuance of common stock under stock option plans 28,384 3 28,381    
Issuance of common stock under stock option plans, shares   1,400      
Stock-based compensation expense 3,027   3,027    
Excess tax benefit from stock option exercises 1,941   1,941    
Payment of dividends (10,014)     (10,014)  
Net income 61,381     61,381  
Net unrealized gain (loss) on available-for-sale investments, net of tax of $185, $123,and $129 respectively for 2010, 2011 and 2012 (507)       (507)
Foreign currency translation adjustment, net of tax of $149, $238 and $7 respectively for 2010, 2011 and 2012 (5,349)       (5,349)
Balance at Dec. 31, 2010 473,311 82 102,620 379,826 (9,217)
Balance, Shares at Dec. 31, 2010   41,065      
Issuance of common stock under stock option plans 30,863 3 30,860    
Issuance of common stock under stock option plans, shares   1,495      
Stock-based compensation expense 8,068   8,068    
Excess tax benefit from stock option exercises 4,045   4,045    
Tax benefit for research and development credits as a result of stock option accounting of stock option accounting 74   74    
Repurchase of common stock (10,000) (1) (9,999)    
Repurchase of common stock, shares   (337)      
Payment of dividends (15,114)     (15,114)  
Net income 69,869     69,869  
Net unrealized gain (loss) on available-for-sale investments, net of tax of $185, $123,and $129 respectively for 2010, 2011 and 2012 355       355
Foreign currency translation adjustment, net of tax of $149, $238 and $7 respectively for 2010, 2011 and 2012 (8,491)       (8,491)
Balance at Dec. 31, 2011 552,980 84 135,668 434,581 (17,353)
Balance, Shares at Dec. 31, 2011 42,223 42,223      
Issuance of common stock under stock option plans 17,468 2 17,466    
Issuance of common stock under stock option plans, shares 842 832      
Stock-based compensation expense 8,520   8,520    
Excess tax benefit from stock option exercises 3,594   3,594    
Payment of dividends (66,213)     (66,213)  
Net income 68,098     68,098  
Reclassification of realized gain on the sale of available-for-sale investments 1,695       1,695
Net unrealized gain (loss) on available-for-sale investments, net of tax of $185, $123,and $129 respectively for 2010, 2011 and 2012 (1,311)       (1,311)
Foreign currency translation adjustment, net of tax of $149, $238 and $7 respectively for 2010, 2011 and 2012 (12,546)       (12,546)
Balance at Dec. 31, 2012 $ 572,285 $ 86 $ 165,248 $ 436,466 $ (29,515)
Balance, Shares at Dec. 31, 2012 43,055 43,055