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Interim Condensed Statements of Changes in Stockholders' Equity (Unaudited) (USD $)
In Thousands, except Share data
Total
Common stock
Additional paid-in capital
Treasury stock
Accumulated other comprehensive income (loss)
Retained earnings (accumulated deficit)
Beginning balance at Dec. 31, 2010 $ 168,468 $ 23 $ 176,838   $ 317 $ (8,710)
Beginning balance, shares at Dec. 31, 2010   22,524,449        
Net income 8,774         8,774
Unrealized gain from available-for-sale securities, net 146       146  
Unrealized gain (loss) from hedging activities, net (24)       (24)  
Equity-based compensation 2,125   2,125      
Tax benefit related to exercise of stock options 1,779   1,779      
Issuance of Common Stock upon exercise of stock options 6,046    [1] 6,046      
Issuance of Common Stock upon exercise of stock options, shares   727,003        
Issuance of Common Stock under employee stock purchase plan 590    [1] 590      
Issuance of Common Stock under employee stock purchase plan, shares   95,252        
Ending balance at Jun. 30, 2011 187,904 23 187,378   439 64
Ending balance, shares at Jun. 30, 2011   23,346,704        
Beginning balance at Dec. 31, 2011 200,920 24 191,945   (901) 9,852
Beginning balance, shares at Dec. 31, 2011   23,543,746        
Net income 8,336         8,336
Unrealized gain from available-for-sale securities, net 501       501  
Unrealized gain (loss) from hedging activities, net 76       76  
Equity-based compensation 2,322   2,322      
Tax benefit related to exercise of stock options 752   752      
Issuance of Common Stock upon exercise of stock options 166    [1] 166      
Issuance of Common Stock upon exercise of stock options, shares   17,448        
Issuance of Common Stock under employee stock purchase plan 629    [1] 629      
Issuance of Common Stock under employee stock purchase plan, shares   33,966        
Purchase of Treasury Stock (20,793) (1)   (20,792)    
Purchase of Treasury Stock, shares   (1,066,742)        
Issuance of Treasury Stock upon exercise of stock options 80    [1]   236   (156)
Issuance of Treasury Stock upon exercise of stock options, shares   10,519        
Ending balance at Jun. 30, 2012 $ 192,989 $ 23 $ 195,814 $ (20,556) $ 324 $ 18,032
Ending balance, shares at Jun. 30, 2012   22,538,937        
[1] Amount less than $1