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Consolidated Statement Of Shareholders' Equity (USD $) In Thousands | Common Stock [Member] | Additional Paid-In Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2010 | $ 340 | $ 594,331 | $ (240,918) | $ 456,514 | $ 606 | $ 810,873
Balance, Shares at Dec. 31, 2010 | 33,959 |  | 2,885 |  |  |
Stock-based compensation |  | 42,965 |  |  |  | 42,965
Stock plan transactions | 4 | 570 |  |  |  | 574
Stock plan transactions, Shares | 398 |  |  |  |  |
Excess tax benefit on stock-based compensation |  | 38,786 |  |  |  | 38,786
Acquisition of treasury stock (value) |  |  | (63,508) |  |  | (63,508)
Acquisition of treasury stock (shares) |  |  | 220 |  |  |
Net income |  |  |  | 214,945 |  | 214,945
Foreign currency translation adjustment |  |  |  |  | (409) | (409)
Balance at Dec. 31, 2011 | 344 | 676,652 | (304,426) | 671,459 | 197 | 1,044,226
Balance, Shares at Dec. 31, 2011 | 34,357 |  | 3,105 |  |  |
Stock-based compensation |  | 66,274 |  |  |  | 66,274
Stock plan transactions | 5 | 476 |  |  |  | 481
Stock plan transactions, Shares | 555 |  |  |  |  |
Excess tax benefit on stock-based compensation |  | 73,210 |  |  |  | 73,210
Acquisition of treasury stock (value) |  |  | (217,092) |  |  | (217,092)
Acquisition of treasury stock (shares) |  |  | 714 |  |  |
Net income |  |  |  | 278,000 |  | 278,000
Foreign currency translation adjustment |  |  |  |  | 827 | 827
Balance at Dec. 31, 2012 | 349 | 816,612 | (521,518) | 949,459 | 1,024 | 1,245,926
Balance, Shares at Dec. 31, 2012 | 34,912 |  | 3,819 |  |  |
Stock-based compensation |  | 64,781 |  |  |  | 64,781
Stock plan transactions | 3 | 97 |  |  |  | 100
Stock plan transactions, Shares | 333 |  |  |  |  |
Excess tax benefit on stock-based compensation |  | 38,350 |  |  |  | 38,350
Acquisition of treasury stock (value) |  |  | (138,903) |  |  | (138,903)
Acquisition of treasury stock (shares) |  |  | 393 |  |  |
Net income |  |  |  | 327,438 |  | 327,438
Foreign currency translation adjustment |  |  |  |  | 596 | 596
Balance at Dec. 31, 2013 | $ 352 | $ 919,840 | $ (660,421) | $ 1,276,897 | $ 1,620 | $ 1,538,288
Balance, Shares at Dec. 31, 2013 | 35,245 |  | 4,212 |  |  |

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