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CONSOLIDATED STATEMENTS OF SHAREHOLDERS EQUITY (USD $)
In Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Balance at Dec. 31, 2009 $ 1,190,098 $ 470 $ 604,435 $ 585,193
Balance, Shares at Dec. 31, 2009   46,963    
Net income 202,691     202,691
Common stock issued under employee stock option and stock purchase plan 22,532 5 22,527  
Common stock issued under employee stock option and stock purchase plan, shares   545    
Issuance of restricted stock   4 (4)  
Issuance of restricted stock, shares   437    
Stock-based compensation expense 25,693   25,693  
Forfeitures of restricted stock            
Forfeitures of restricted stock, shares   (8)    
Excess tax benefit related to employee stock incentive plans 3,046   3,046  
Excess tax benefit related to resolution of income tax matters 3,394   3,394  
Balance at Dec. 31, 2010 1,447,454 479 659,091 787,884
Balance, Shares at Dec. 31, 2010   47,937    
Net income 217,997     217,997
Common stock issued under employee stock option and stock purchase plan 31,362 7 31,355  
Common stock issued under employee stock option and stock purchase plan, shares   671    
Issuance of restricted stock   3 (3)  
Issuance of restricted stock, shares   340    
Stock-based compensation expense 27,092   27,092  
Forfeitures of restricted stock            
Forfeitures of restricted stock, shares   (15)    
Excess tax benefit related to employee stock incentive plans 7,111   7,111  
Balance at Dec. 31, 2011 1,731,016 489 724,646 1,005,881
Balance, Shares at Dec. 31, 2011   48,933    
Net income 240,907     240,907
Common stock issued under employee stock option and stock purchase plan 28,810 6 28,804  
Common stock issued under employee stock option and stock purchase plan, shares   660    
Issuance of restricted stock   5 (5)  
Issuance of restricted stock, shares   465    
Stock-based compensation expense 28,437   28,437  
Forfeitures of restricted stock            
Forfeitures of restricted stock, shares   (39)    
Excess tax benefit related to employee stock incentive plans 6,198   6,198  
Balance at Dec. 31, 2012 $ 2,035,368 $ 500 $ 788,080 $ 1,246,788
Balance, Shares at Dec. 31, 2012   50,019