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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 |  |  |

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