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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified | Total | Common stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury stock
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 584,953 | $ 973 | $ 136,553 | $ 670,396 | $ (4,667) | $ (218,302)
Balance (in shares) at Dec. 31, 2009 |  | 194,570 |  |  |  | (18,252)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation | 16,810 |  | 16,810 |  |  |
Exercise of stock options | 20,824 | 15 | 20,809 |  |  |
Exercise of stock options (in shares) |  | 2,892 |  |  |  |
Excess tax benefits from share based payment arrangements | 12,374 |  | 12,374 |  |  |
Repurchase of common stock | (23,540) |  |  |  |  | (23,540)
Repurchase of common stock (in shares) |  |  |  |  |  | (1,250)
Foreign currency translation | 1,837 |  |  |  | 1,837 |
Change in unrealized gain on available-for-sale securities, net of tax | 3,111 |  |  |  | 3,111 |
Net income | 212,029 |  |  | 212,029 |  |
Balance at Dec. 31, 2010 | 828,398 | 988 | 186,546 | 882,425 | 281 | (241,842)
Balance (in shares) at Dec. 31, 2010 |  | 197,462 |  |  |  | (19,502)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation | 18,619 |  | 18,619 |  |  |
Exercise of stock options | 20,318 | 6 | 20,312 |  |  |
Exercise of stock options (in shares) |  | 1,181 |  |  |  |
Issuance of restricted stock (in shares) |  | 86 |  |  |  |
Excess tax benefits from share based payment arrangements | 3,824 |  | 3,824 |  |  |
Repurchase of common stock | (176,392) |  |  |  |  | (176,392)
Repurchase of common stock (in shares) |  |  |  |  |  | (4,950)
Foreign currency translation | (3,306) |  |  |  | (3,306) |
Change in unrealized gain on available-for-sale securities, net of tax | 1,478 |  |  |  | 1,478 |
Net income | 286,219 |  |  | 286,219 |  |
Balance at Dec. 31, 2011 | 979,158 | 994 | 229,301 | 1,168,644 | (1,547) | (418,234)
Balance (in shares) at Dec. 31, 2011 |  | 198,729 |  |  |  | (24,452)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Stock-based compensation | 28,007 |  | 28,007 |  |  |
Exercise of stock options | 11,014 | 25 | 10,989 |  |  |
Exercise of stock options (in shares) |  | 5,030 |  |  |  |
Excess tax benefits from share based payment arrangements | 19,656 |  | 19,656 |  |  |
Repurchase of common stock | (737,079) |  |  |  |  | (737,079)
Repurchase of common stock (in shares) |  |  |  |  |  | (13,531)
Foreign currency translation | 2,096 |  |  |  | 2,096 |
Change in unrealized gain on available-for-sale securities, net of tax | 1,525 |  |  |  | 1,525 |
Net income | 340,020 |  |  | 340,020 |  |
Balance at Dec. 31, 2012 | $ 644,397 | $ 1,019 | $ 287,953 | $ 1,508,664 | $ 2,074 | $ (1,155,313)
Balance (in shares) at Dec. 31, 2012 |  | 203,759 |  |  |  | (37,983)

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