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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