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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]
--- | --- | --- | --- | --- | ---
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 | 15,579 | 2 | 15,577 |  |
Issuance of common stock under stock option plans, shares | 745 | 738 |  |  |
Stock-based compensation expense | 6,795 |  | 6,795 |  |
Excess tax benefit from stock option exercises | 3,256 |  | 3,256 |  |
Payment of dividends | (13,706) |  |  | (13,706) |
Net income | 51,854 |  |  | 51,854 |
Net unrealized gain on available-for- sale investments, net of tax of $302 | 730 |  |  |  |
Foreign currency translation adjustment, net of tax of $180 | (12,086) |  |  |  | (12,086)
Balance at Sep. 30, 2012 | $ 605,402 | $ 86 | $ 161,296 | $ 472,729 | $ (28,709)
Balance, Shares at Sep. 30, 2012 | 42,961 | 42,961 |  |  |

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