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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, 2009 | $ 335 | $ 539,880 | $ (114,316) | $ 277,533 | $ 29 | $ 703,461
Balance, Shares at Dec. 31, 2009 | 33,473 |  | 1,990 |  |  |
Stock-based compensation | 2 | 22,278 |  |  |  | 22,280
Stock-based compensation, Shares | 166 |  |  |  |  |
Employee stock plan transactions | 3 | 17,647 |  |  |  | 17,650
Employee stock plan transactions, Shares | 320 |  |  |  |  |
Excess tax benefit on stock-based compensation |  | 14,526 |  |  |  | 14,526
Acquisition of treasury stock |  |  | (126,602) |  |  | (126,602)
Acquisition of treasury stock, Shares |  |  | 895 |  |  |
Net income |  |  |  | 178,981 |  | 178,981
Foreign currency translation adjustment |  |  |  |  | 577 | 577
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-based compensation, Shares | 3 |  |  |  |  |
Employee stock plan transactions | 4 | 570 |  |  |  | 574
Employee stock plan transactions, Shares | 395 |  |  |  |  |
Excess tax benefit on stock-based compensation |  | 38,786 |  |  |  | 38,786
Acquisition of treasury stock |  |  | (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 | 1 | 66,273 |  |  |  | 66,274
Stock-based compensation, Shares | 83 |  |  |  |  |
Employee stock plan transactions | 4 | 477 |  |  |  | 481
Employee stock plan transactions, Shares | 472 |  |  |  |  |
Excess tax benefit on stock-based compensation |  | 73,210 |  |  |  | 73,210
Acquisition of treasury stock |  |  | (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 |  |  |

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