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Consolidated Statements of Stockholders' Equity (USD $) In Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | ---
Stockholders' equity, beginning balance at Dec. 31, 2010 | $ 1,068,797 | $ 1,511 | $ 970,068 | $ 2,618,479 | $ (2,509,466) | $ (11,795)
Number of common shares, beginning balance at Dec. 31, 2010 | 151,054 |  |  |  |  |
Net income | 432,968 |  |  | 432,968 |  |
Other comprehensive income (loss) | (24,260) |  |  |  |  | (24,260)
Issuance of common stock for Employee Stock Purchase Plan | 4,150 | 1 | 4,149 |  |  |
Issuance of common stock for Employee Stock Purchase Plan, shares | 58 |  |  |  |  |
Issuance of common stock for stock options exercised | 56,003 | 14 | 55,989 |  |  |
Issuance of common stock for stock options exercised, shares | 1,381 |  |  |  |  |
Tax benefit related to stock option plans | 32,239 |  | 32,239 |  |  |
(Increase in) release of valuation allowance | 176 |  | 176 |  |  |
Treasury stock | (370,835) |  |  |  | (370,835) |
Stock-based compensation | 27,340 | 2 | 27,338 |  |  |
Stock-based compensation, shares | 264 |  |  |  |  |
Stockholders' equity, ending balance at Dec. 31, 2011 | 1,226,578 | 1,528 | 1,089,959 | 3,051,447 | (2,880,301) | (36,055)
Number of common shares, ending balance at Dec. 31, 2011 | 152,757 |  |  |  |  |
Net income | 461,443 |  |  | 461,443 |  |
Other comprehensive income (loss) | 9,660 |  |  |  |  | 9,660
Issuance of common stock for Employee Stock Purchase Plan | 4,661 | 1 | 4,660 |  |  |
Issuance of common stock for Employee Stock Purchase Plan, shares | 66 |  |  |  |  |
Issuance of common stock for stock options exercised | 24,208 | 6 | 24,202 |  |  |
Issuance of common stock for stock options exercised, shares | 630 |  |  |  |  |
Tax benefit related to stock option plans | 10,568 |  | 10,568 |  |  |
(Increase in) release of valuation allowance | (2,354) |  | (2,354) |  |  |
Treasury stock | (295,878) |  |  |  | (295,878) |
Stock-based compensation | 28,471 | 2 | 28,469 |  |  |
Stock-based compensation, shares | 243 |  |  |  |  |
Stockholders' equity, ending balance at Dec. 31, 2012 | 1,467,357 | 1,537 | 1,155,504 | 3,512,890 | (3,176,179) | (26,395)
Number of common shares, ending balance at Dec. 31, 2012 | 153,696 |  |  |  |  |
Net income | 450,003 |  |  | 450,003 |  |
Other comprehensive income (loss) | 32,274 |  |  |  |  | 32,274
Issuance of common stock for Employee Stock Purchase Plan | 4,817 | 1 | 4,816 |  |  |
Issuance of common stock for Employee Stock Purchase Plan, shares | 58 |  |  |  |  |
Issuance of common stock for stock options exercised | 64,141 | 13 | 64,128 |  |  |
Issuance of common stock for stock options exercised, shares | 1,281 |  |  |  |  |
Tax benefit related to stock option plans | 15,842 |  | 15,842 |  |  |
(Increase in) release of valuation allowance | (892) |  | (892) |  |  |
Treasury stock | (301,580) |  |  |  | (301,580) |
Stock-based compensation | 31,211 | 1 | 31,210 |  |  |
Stock-based compensation, shares | 211 |  |  |  |  |
Stockholders' equity, ending balance at Dec. 31, 2013 | $ 1,763,173 | $ 1,552 | $ 1,270,608 | $ 3,962,893 | $ (3,477,759) | $ 5,879
Number of common shares, ending balance at Dec. 31, 2013 | 155,246 |  |  |  |  |

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