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Consolidated Statements Of Shareholders' Equity (USD $)
In Thousands
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2008 $ 456 $ 555,293 $ 409,389 $ 965,138
Balance, shares at Dec. 31, 2008 45,642      
Net income     175,804 175,804
Common stock issued under employee stock option and stock purchase plans, value 8 17,951   17,959
Common stock issued under employee stock option and stock purchase plans, shares 794      
Issuance of restricted stock, value 6 (6)    
Issuance of restricted stock, shares 553      
Stock-based compensation expense   24,320   24,320
Forfeitures of restricted stock            
Forfeitures of restricted stock, shares (26)      
Excess tax benefit related to employee stock incentive plans   6,877   6,877
Balance at Dec. 31, 2009 470 604,435 585,193 1,190,098
Balance, shares at Dec. 31, 2009 46,963      
Net income     202,691 202,691
Common stock issued under employee stock option and stock purchase plans, value 5 22,527   22,532
Common stock issued under employee stock option and stock purchase plans, shares 545      
Issuance of restricted stock, value 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 479 659,091 787,884 1,447,454
Balance, shares at Dec. 31, 2010 47,937      
Net income     217,997 217,997
Common stock issued under employee stock option and stock purchase plans, value 7 31,355   31,362
Common stock issued under employee stock option and stock purchase plans, shares 671      
Issuance of restricted stock, value 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 $ 489 $ 724,646 $ 1,005,881 $ 1,731,016
Balance, shares at Dec. 31, 2011 48,933