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Consolidated Statement of Shareholders' Equity and Comprehensive Income (USD $)
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2008 $ 413,075,000 $ 79,000 $ 73,280,000 $ 345,225,000 $ (5,509,000)  
Beginning Balance, Shares at Dec. 31, 2008   39,655,000        
Issuance of common stock under stock option and stock purchase plans 146,000   146,000      
Issuance of common stock under stock option and stock purchase plans, Shares   10,000        
Stock-based compensation expense 9,223,000   9,223,000      
Stock option buyback (9,158,000)   (9,158,000)      
Relief of deferred tax asset related to stock option buyback (3,748,000)   (3,748,000)      
Excess tax benefit from stock option exercises (472,000)   (472,000)      
Payment of dividends (11,897,000)     (11,897,000)    
Comprehensive income loss:            
Net income (loss) (4,869,000)     (4,869,000)   (4,869,000)
Net unrealized gain (loss) on available-for-sale investments, net of tax of $110, $185 and $123 respectively for 2009, 2010 and 2011 (189,000)       (189,000) (189,000)
Foreign currency translation adjustment, net of tax of $271, $149 and $238 respectively for 2009, 2010 and 2011 2,337,000       2,337,000 2,337,000
Comprehensive income (loss)           (2,721,000)
Ending Balance at Dec. 31, 2009 394,448,000 79,000 69,271,000 328,459,000 (3,361,000)  
Ending Balance, Shares at Dec. 31, 2009   39,665,000        
Issuance of common stock under stock option plans 28,384,000 3,000 28,381,000      
Issuance of common stock under stock option plans, Shares   1,400,000        
Stock-based compensation expense 3,027,000   3,027,000      
Excess tax benefit from stock option exercises 1,941,000   1,941,000      
Payment of dividends (10,014,000)     (10,014,000)    
Comprehensive income loss:            
Net income (loss) 61,381,000     61,381,000   61,381,000
Net unrealized gain (loss) on available-for-sale investments, net of tax of $110, $185 and $123 respectively for 2009, 2010 and 2011 (507,000)       (507,000) (507,000)
Foreign currency translation adjustment, net of tax of $271, $149 and $238 respectively for 2009, 2010 and 2011 (5,349,000)       (5,349,000) (5,349,000)
Comprehensive income (loss)           55,525,000
Ending Balance at Dec. 31, 2010 473,311,000 82,000 102,620,000 379,826,000 (9,217,000)  
Ending Balance, Shares at Dec. 31, 2010 41,065,000 41,065,000        
Issuance of common stock under stock option plans 30,863,000 3,000 30,860,000      
Issuance of common stock under stock option plans, Shares 1,501,000 1,495,000        
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) (1,000) (9,999,000)      
Repurchase of common stock, Shares (337,078) (337,000)        
Payment of dividends (15,114,000)     (15,114,000)    
Comprehensive income loss:            
Net income (loss) 69,869,000     69,869,000   69,869,000
Net unrealized gain (loss) on available-for-sale investments, net of tax of $110, $185 and $123 respectively for 2009, 2010 and 2011 355,000       355,000 355,000
Foreign currency translation adjustment, net of tax of $271, $149 and $238 respectively for 2009, 2010 and 2011 (8,491,000)       (8,491,000) (8,491,000)
Comprehensive income (loss)           61,733,000
Ending Balance at Dec. 31, 2011 $ 552,980,000 $ 84,000 $ 135,668,000 $ 434,581,000 $ (17,353,000)  
Ending Balance, Shares at Dec. 31, 2011 42,223,000 42,223,000