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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