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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Other Comprehensive Income [Member]
Retained Earnings [Member]
Beginning Balance at Dec. 31, 2009 $ 199,143 $ 53 $ 0 $ 273 $ 198,817
Beginning Balance (in shares) at Dec. 31, 2009   53,440,073      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 160,853       160,853
Other comprehensive income 477     477  
Comprehensive income 161,330        
Issuance of common stock upon exercise of options 47,082 2 47,080    
Issuance of common stock upon exercise of options (in shares) 1,902,073 1,902,073      
Issuance of common stock under employee stock purchase plan 2,694   2,694    
Issuance of common stock under employee stock purchase plan (in shares)   46,112      
Repurchases of common stock and retirement of outstanding treasury stock (210,259) (2) (88,326)   (121,931)
Repurchases of common stock and retirement of outstanding treasury stock (in shares) (2,606,000) (2,606,309)      
Stock-based compensation expense 27,996   27,996    
Excess stock option income tax benefits 62,178   62,178    
Ending Balance at Dec. 31, 2010 290,164 53 51,622 750 237,739
Ending Balance (in shares) at Dec. 31, 2010   52,781,949      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 226,126       226,126
Other comprehensive income (44)     (44)  
Comprehensive income 226,082        
Issuance of common stock upon exercise of options 19,614 0 19,614    
Issuance of common stock upon exercise of options (in shares) 659,370 659,370      
Issuance of common stock, net of costs 199,486 3 199,483    
Issuance of common stock, net of costs (in shares)   2,857,143      
Repurchases of common stock and retirement of outstanding treasury stock (199,666) (1) (158,730)   (40,935)
Repurchases of common stock and retirement of outstanding treasury stock (in shares) (900,000) (899,847)      
Stock-based compensation expense 61,582   61,582    
Excess stock option income tax benefits 45,548   45,548    
Ending Balance at Dec. 31, 2011 642,810 55 219,119 706 422,930
Ending Balance (in shares) at Dec. 31, 2011   55,398,615      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 17,152       17,152
Other comprehensive income 2,213     2,213  
Comprehensive income 19,365        
Issuance of common stock upon exercise of options 4,124 1 4,123    
Issuance of common stock upon exercise of options (in shares) 188,552 188,552      
Stock-based compensation expense 73,948   73,948    
Excess stock option income tax benefits 4,426   4,426    
Ending Balance at Dec. 31, 2012 $ 744,673 $ 56 $ 301,616 $ 2,919 $ 440,082
Ending Balance (in shares) at Dec. 31, 2012   55,587,167